Lythrum salicaria lyth·rum·sa·licaria uncommon noun 1. marsh herb with a long spike of purple flowers; originally of Europe but now rampant in eastern United States Synonymspurple loosestrifespiked loosestrifeLythrum salicaria Related words Broader terms loosestrife Parts Lythrum WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
