cannabin

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

• noun A resinous material extracted from cannabis.

from The Century Dictionary.

• noun A brown liquid alkaloid said to be isolated from Indian hemp. Cannabis Indica. It is hypnotic.
• noun A resin obtained from the plant Cannabis Indica. It is probably the active principle of the drug hashish.

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

• noun (Chem.) A poisonous resin extracted from hemp (Cannabis sativa, variety Indica). The euphoric and narcotic effects of hasheesh are due to this resin; the active ingredient is tetrahydrocannabinol, THC. See Cannabis Indica, below.

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

• noun organic chemistry A poisonous resin extracted from hemp (Cannabis sativa, variety Indica), responsible for the narcotic effects of hashish.

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

• noun a resin obtained from the hemp plant; thought to be the active narcotic agent in marijuana