What does treif mean? Treif (also spelled trayf, treyf, or traif) is the Yiddish word for “unkosher,” and Chabad.org says it comes from the Hebrew treifah, something mangled or torn apart. If you keep kosher and want to know whether a specific fish is treif or fine, you can check it in seconds with the KosherFish lookup tool.
What Does Treif Mean in Plain English?
In everyday speech, treif means any food that is not kosher. Chabad.org gives two examples: a mixture of meat and milk, and the flesh of a non-kosher species. A cheeseburger is treif. So is a shrimp cocktail. Neither one involves an animal that something tore apart. That gap between the modern word and its root causes most of the confusion.
The word works as the opposite of kosher, which literally means “fit.” Chabad.org notes that people stretch both words past food. They call anything above board kosher, and they informally call any action treif. This guide sticks to the food meaning.
Where the Word Treif Comes From
The word starts with a verse about field kills. Chabad.org quotes Exodus 22:30: “Flesh torn (treifah) in the field you shall not eat. You shall throw it to the dog.” The Torah forbade any animal that wild beasts mauled, and the Hebrew word for that torn flesh gave Yiddish its word.
Leviticus 22:8 widened the idea. Chabad.org quotes it this way: “He shall not eat a carcass or anything that was torn (treifah).” According to Chabad.org, that verse stretched the term to cover all forbidden dead things.
The sages went further still. Chabad.org says the sages forbid an animal with an injury or illness bad enough to kill it soon, even if a slaughterer kills it before it dies of its wounds. Chabad.org puts the rule for kosher meat in five words: only fit and healthy animals are kosher.
Treif vs Non-Kosher: Is There a Difference?
In its original sense, yes. Chabad.org explains that treifah first meant an animal a predator had mauled, or one with injuries bad enough to kill it soon, even when the Torah permitted its species. The OU still uses the word that way when a bodek finds a defect in a slaughtered animal. “Non-kosher” is the wider term, and it also covers species the Torah never allowed. In daily conversation, almost nobody keeps the two apart, and Chabad.org notes that people call both a meat-and-milk mix and a non-kosher species treif.
The practical takeaway is simple. If a menu, a host, or a label says an item is treif, treat it as off limits. If you want to know which of the two reasons applies, ask your own rabbi.
What Makes a Land Animal Treif?
A kosher cow can still end up treif. The OU says kosher mammals chew their cud and have cloven hooves, and lists the cow, goat, sheep, deer, and bison among them. Slaughter alone does not finish the job. After shechita, a trained inspector called a bodek checks the animal for physical abnormalities that can make it non-kosher (treif), according to the OU.
The lungs get the closest look. The OU explains that an adhesion on the lung may point to a puncture, so the bodek examines it further. Not every adhesion disqualifies an animal. Meat labeled glatt comes from an animal whose lungs were free of all adhesions, the OU says. We explain the label in our guide to what glatt kosher means, and the slaughter itself in what shechita is.
Poultry follows its own list. The OU primer says the Torah names 24 forbidden species of fowl and treats all other birds as kosher in principle. In the United States, the OU says mainstream kashrut agencies accept only chicken, turkey, duck, and goose.
What Makes a Fish Treif?
Fish skip the whole inspection and slaughter system, so the test is simpler. A kosher fish needs fins and scales, and the OU adds that the scales must come off easily without damaging the skin. That rule comes from Leviticus 11:9-12 and Deuteronomy 14:9-10. Fish do not need shechita, but the OU says the scales must stay visible.
Everything that fails the fins-and-scales test is treif in the everyday sense. The OU primer rules out all shellfish. That puts lobster, crab, and shrimp on the list. The removable-scales rule also excludes fish whose scales sit embedded in the skin, such as sturgeon. Our guide to what makes a fish kosher walks through each scale type.
| Item | Treif? | Why |
|---|---|---|
| Cheeseburger | ❌ Yes | Meat and milk together, which the OU says the Torah forbids cooking in any form |
| Shrimp | ❌ Yes | The OU primer rules out all shellfish |
| Salmon fillet with certification | ✅ No | Kosher species with fins and removable scales, and the OU says fillets need supervision or a skin tab |
| Kosher beef from a bodek-inspected animal | ✅ No | Cloven hooves, chews cud, a shochet performed shechita, and a bodek checked the lungs |
| Beef from a cow with a punctured lung | ❌ Yes | A kosher species that the bedikah found defective |
| Skinless fish fillet with no certification | ⚠️ Check | The OU says to buy fillets only with supervision or a skin tab with scales attached |
Treif vs Kosher: How the Everyday Meaning Spread
Meat and milk is the case people hit most. The OU primer says the Torah forbids cooking meat and milk together in any form, and rabbinic law extends the rule to eating them at the same meal. The most common custom is to wait six hours between meat and dairy, according to the OU. Anything that breaks the rule earns the label treif, even when each ingredient was kosher alone.
Fish and meat is a smaller question. The OU primer says you may not eat fish and meat together, though you can eat one after the other. We cover it in our guide to eating fish and meat together. Fish itself is pareve, which we define in what pareve means.
How to Tell Whether a Food Is Treif
Look for a reliable hechsher. Meat and poultry often carry a metal tag, or arrive in tamper-proof packaging with the kosher logo showing, the OU says. An OU label with no suffix marks a pareve item, while OU Meat and OU Dairy mark the others.
For fish, the skin is your proof. The OU says filleted or ground fish needs supervision, or a skin tab with scales attached. Our posts on kosher symbols and on whether fish needs a hechsher go deeper. Nobody here is issuing a ruling, so if a label or a restaurant leaves you unsure, ask the certifying agency or your own rabbi.
A Quick Word on “The Treif Land”
The word has its own immigration story. Chabad.org says some pious European Jews called America di treifine medineh, “the treif land,” because they assumed immigrants would abandon Jewish practice. In 1940, the previous Lubavitcher Rebbe, Rabbi Yosef Yitzchak Schneersohn, arrived in New York. He declared that “America is nisht andersh,” which means America is no different. He then founded Jewish institutions across the Northeast and Canada, and Chabad.org says those grew into thousands of Chabad centers worldwide.
Check Any Fish with KosherFish
When the question is about fish, you do not need to guess. You can look up any fish and 290+ others on the full kosher fish list, search by name in the KosherFish lookup tool, or check a fish at the counter with the iOS app or the Android app. Start with a common one like salmon or a famous no like shark.
Frequently Asked Questions
What does treif mean?
Treif means unkosher. Chabad.org says the Yiddish word comes from the Hebrew treifah, something mangled or torn apart, and in common use it covers any food that is not kosher. A cheeseburger and the flesh of a non-kosher species both qualify, according to Chabad.org.
What is the difference between treif and non-kosher?
In its original sense, treif means an animal of a permitted species that a predator mauled or that had a fatal injury or defect. Non-kosher also covers species the Torah never allowed. Chabad.org notes that everyday speech calls both treif, from a meat-and-milk mix to a non-kosher species. If the difference matters for a specific food, ask your own rabbi.
Where does the word treif come from?
It comes from Exodus 22:30, which Chabad.org quotes as ‘Flesh torn (treifah) in the field you shall not eat.’ Leviticus 22:8 widened the term, and Chabad.org says it came to cover all forbidden dead things. Yiddish speakers then used treif for anything unkosher.
Is shrimp treif?
Yes, shrimp is treif in the everyday sense. The OU primer rules out all shellfish, and it says a kosher fish must have fins and scales that come off easily without damaging the skin. Shrimp has neither, so it fails the test from Leviticus 11:9-12 and Deuteronomy 14:9-10.
Can a kosher animal become treif?
Yes. The OU says a bodek inspects an animal after slaughter for abnormalities that may make it non-kosher, such as lung adhesions that suggest a puncture. Chabad.org adds that the sages forbid an animal with an injury or illness bad enough to kill it soon, even if a shochet slaughtered it first. Only fit and healthy animals are kosher.
Is a cheeseburger treif?
Yes. The OU says the Torah forbids cooking meat and milk together in any form, and rabbinic law extends that to eating them at the same meal. Chabad.org lists a meat-and-milk mixture as a standard example of treif food, even when both ingredients are kosher on their own.
Is fish treif if it has no scales?
A fish without scales is not kosher, so people call it treif in the everyday sense. The OU says a kosher fish needs fins and scales, and the scales must come off without damaging the skin. You can look up any species on our kosher fish list before you buy it.
The Bottom Line
Treif means unkosher. The word started with torn field kills in Exodus 22:30 and grew to cover any forbidden food, from a meat-and-milk mix to shellfish to a cow that failed its lung check. For fish, the test is fins and scales that come off easily. Browse the kosher fish list, look up any species in the KosherFish lookup tool, or keep the iOS or Android app handy. For more background, read our kosher dietary laws guide and our post on how to keep kosher.