Pilea pi·lea uncommon noun 1. low-growing tropical perennials grown for their stingless foliage Synonymsgenus Pilea Related words Word family Pilea involucrataPilea microphyllaPilea pumilla Broader terms dicot genus Parts Urticaceae Part of richweedartillery plantfriendship plant WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.