(UK, historical) A Breton agricultural labourer who travelled through English cities selling onions from a bicycle.

(computing) A technique for anonymous communication over a computer network, the messages being repeatedly encrypted and sent through nodes called onion routers, each of which performs only one stage of the decryption.

spring onion

plural of salad onion

plural of sea onion

Drimia maritima, the sea squill, native to Mediterranean and adjoining coasts. / Scilla verna, the spring squill, of Atlantic Europe.

plural of onion Johnny

plural of potato onion

(chiefly historical) A Breton farmer and agricultural labourer on a bicycle who sells distinctive pink onions door to door in Great Britain.

Used other than figuratively or idiomatically: A seed produced by an onion plant.