n. A genus of ericaceous plants, now referred to Rhododendron.n. [lowercase] A plant or flower belonging to this genus. See Rhododendron.n. [lowercase] A name of a species of plants of the genus Loiseleuria, the Alpine azalean. Azalea arborescens, a species growing in the Alleghanies, forming a small tree and bearing innumerable white and pink spicy-scented flowers.