'Sea onion' definitions:

Definition of 'sea onion'

(from WordNet)
noun
Having dense spikes of small white flowers and yielding a bulb with medicinal properties [syn: sea squill, sea onion, squill, Urginea maritima]
noun
European scilla with small blue or purple flowers [syn: spring squill, Scilla verna, sea onion]

Definition of 'Sea onion'

From: GCIDE
  • Sea onion \Sea" on"ion\ (Bot.) The officinal squill. See Squill. [1913 Webster]

Definition of 'sea onion'

From: GCIDE
  • Squill \Squill\ (skw[i^]l), n. [F. squille (also scille a squill, in sense 1), L. squilla, scilla, Gr. ?.]
  • 1. (Bot.) (a) A European bulbous liliaceous plant ({Urginea maritima}, formerly Scilla maritima), of acrid, expectorant, diuretic, and emetic properties, used in medicine. Called also sea onion. (b) Any bulbous plant of the genus Scilla; as, the bluebell squill (Scilla mutans). [1913 Webster]
  • 2. (Zool.) (a) A squilla. (b) A mantis. [1913 Webster]