onion seed Rate this phrase:(3.00 / 1 vote)
Used other than as an idiom: A seed produced by an onion plant.

Additional definitions for 'onion seed':

onion seedThe strong-flavored seed of black caraway or nigella, Nigella sativa, which is deep black with flat sides, like those of the onion.
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"onion seed." Phrases.net. STANDS4 LLC, 2018. Web. 18 Jul 2018. <http://www.phrases.net/phrase/onion-seed_14021>.

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