Allium ascalonicum al·liu·mas·calonicum uncommon noun 1. type of onion plant producing small clustered mild-flavored bulbs used as seasoning Synonymsshalloteschalotmultiplier onionAllium cepa aggregatumAllium ascalonicum Related words Broader terms onion Part of shallot WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.