An adult castrated male of cattle (B. taurus), especially when used as a beast of burden. / Any bovine animal (genus Bos). A neat, a beef.

Abbreviation of oxygen.

(nonstandard) plural of ox

(astronomy) A Chinese constellation located near Capricorn, one of the 28 lunar mansions and part of the larger Black Turtle.

(chemistry) Alternative form of oxo-, used before vowels.

An Arctic mammal, Ovibos moschatus of the Caprinae subfamily of the family Bovidae, having a thick coat and long curved horns.

(simile) Very strong and powerful.

(idiomatic, chiefly southern US) This is a big problem; there is unavoidable or demanding work ahead.

(archaic) The yak.

zebu