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 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.
• noun The common name of the plants of the genus Aloë.

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