Eleocharis eleoc·ha·ris uncommon noun 1. sedges having dense spikes of flowers and leaves reduced to basal sheaths Synonymsgenus Eleocharis Related words Word family Eleocharis acicularisEleocharis dulcisEleocharis palustris Broader terms monocot genus Parts Cyperaceae Part of spike rush WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.