Onion-seed Definition
noun
Used other than as an idiom: A seed produced by an onion plant.
Wiktionary
The strong-flavored seed of black caraway or nigella, Nigella sativa, which is deep black with flat sides, like those of the onion.
Wiktionary
Other Word Forms of Onion-seed
Noun
Singular:
onion-seed
Plural:
onion seeds
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