Ledum le·dum uncommon noun 1. evergreen shrubs of north temperate regions Synonymsgenus Ledum Related words Word family Ledum groenlandicumLedum palustre Broader terms dilleniid dicot genus Parts Ericaceae Part of Labrador teatrapper's teawild rosemary WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.