top onion is a noun meaning "type of perennial onion grown chiefly as a curiosity or for early salad onions; having bulbils that replace the flowers". It carries one recorded sense.
type of perennial onion grown chiefly as a curiosity or for early salad onions; having bulbils that replace the flowers
Definitions, synonyms and semantic relations for top onion come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.