The American Heritage® Dictionary of the English Language, 4th Edition
n. A liquid, C10H16, with a characteristic lemonlike fragrance, used as a solvent, wetting agent, and dispersing agent and in the manufacture of resins.
n. A monoterpene hydrocarbon 1-methyl-4-prop-1-en-2-yl-cyclohexene found in the essential oils of oranges, lemons and similar fruit, and mainly responsible for their fragrance
the GNU version of the Collaborative International Dictionary of English
n. a liquid terpene with a lemon odor; found in lemons and oranges and other essential oils.
The Century Dictionary and Cyclopedia
n. A general term applied to certain terpenes, C10H16.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a liquid terpene with a lemon odor; found in lemons and oranges and other essential oils
Word Usage
"In addition to copious amounts of vitamin C and antioxidants, citrus oils contain limonene, which is said to increase the level of glutathione S-transferase, one of the most important Phase II conjugators."