Definitions

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

  • noun A chemical emitted by an organism that influences the physiology or behavior of an organism of the same or a different species, such as a pheromone or an allelochemical.

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

  • noun biochemistry Any substance, produced by an organism, that provokes a response in individuals of the same or different species

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Greek sēmeion, sign; see semiotic + chemical.]

Examples

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