the GNU version of the Collaborative International Dictionary of English
n. A plant growing entirely in the air, and receiving its nourishment from it; an air plant or epiphyte.
The Century Dictionary and Cyclopedia
n. A plant which lives exclusively in air, absorbing all its nourishment from it alone, as some orchids and many Bromeliaceæ; an air-plant. See epiphyte.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. plant that derives moisture and nutrients from the air and rain; usually grows on another plant but not parasitic on it