mountain azalea moun·tai·na·zalea uncommon noun 1. creeping mat-forming evergreen shrub of high mountain regions of northern hemisphere grown for its rose-pink flowers Synonymsalpine azaleamountain azaleaLoiseleuria procumbens Related words Broader terms shrub Parts Loiseleuria WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.