aloe

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various chiefly African plants of the genus Aloe, having rosettes of succulent, often spiny-margined leaves and long stalks bearing yellow, orange, or red tubular flowers.
• noun A laxative drug obtained from the processed juice of certain species of aloe.

from The Century Dictionary.

• noun The common name of the plants of the genus Aloë.
• noun A genus of liliaceous plants, including trees, shrubs, and a few perennial herbs, with thick fleshy leaves, usually spinosely toothed and rosulate at the summit of the caudex. See aloe.

from the GNU version of the Collaborative International Dictionary of English.

• noun obsolete The wood of the agalloch.
• noun (Bot.) A genus of succulent plants, some classed as trees, others as shrubs, but the greater number having the habit and appearance of evergreen herbaceous plants; from some of which are prepared articles for medicine and the arts. They are natives of warm countries.
• noun (Med.), Plural in form but syntactically singular. The inspissated juice of several species of aloe, used as a purgative.
• noun the agave. See Agave.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun in the plural The resins of the trees Aquilaria agallocha and Aquilaria malaccensis, known for their fragrant odour
• noun A plant of the genus Aloe.
• noun A strong, bitter drink made from the juice of such plants, used as a purgative.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun succulent plants having rosettes of leaves usually with fiber like hemp and spikes of showy flowers; found chiefly in Africa