Meanings
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1
adj
Resembling an onion or onions, especially in terms of smell.
The leaves of the Salad leek possess a somewhat oniony taste and smell, and are extensively eaten raw as a relish.
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2
adj
Flavoured with onions.
No more will the messenger boy, the rounder, or the girl about town be able to indulge in the oniony hamburger, the last year’s chicken sandwich, or any of the other edibles and indigestibles furnished by the wheeled commissaries.
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3
adj
Resembling or characteristic of the satirical news website The Onion.
Many of these submissions were deleted for not having “an oniony quality” (seeming more like satire than news, not just a funny title) or being from an unreliable news source.
Thesaurus
Etymology
From onion + -y. In sense 3, after the mock news outlet The Onion.