noun
A monocotyledonous plant (Allium cepa), allied to garlic, used as vegetable and spice.
The bulb of such a plant.
Any of various plants, mostly of the genus Allium, that are more or less similar to Allium cepa.
(slang) Of a drug, an ounce.
(obsolete baseball slang) A ball.
(obsolete, slang) A watch-seal.
Alternative letter-case form of Onion (“an inhabitant of Bermuda; a Bermudian”).
(4chan slang, slang) Soy, particularly when used in compound words related to the soy boy stereotype.