Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun onion

3 senses of onion

Sense 1
onion -- (the bulb of an onion plant)
       => bulb -- (a modified bud consisting of a thickened globular underground stem serving as a reproductive structure)

Sense 2
onion, onion plant, Allium cepa -- (bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb)
       => alliaceous plant -- (bulbous plants having a characteristic pungent onion odor)

Sense 3
onion -- (an aromatic flavorful vegetable)
       => vegetable, veggie, veg -- (edible seeds or roots or stems or leaves or bulbs or tubers or nonsweet fruits of any of numerous herbaceous plant)