Other forms: gristles
Gristle is a chewy, inedible part of meat. If there's too much gristle in your steak, you might send it back — or think seriously about becoming a vegetarian.
Gristle is an unpleasant surprise in a bite of meat, a fibrous bit you may end up spitting in your napkin. It makes sense you can't chew it, since gristle is a type of connective tissue that's mainly found in ligaments and doesn't break down when it's cooked. Skilled cooks can easily cut out any gristle before cooking meat. In Old English, gristle simply meant "cartilage."