From ZooTerms (Dictionary of Invertebrate Zoology)
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allelochemic also allelochemical (noun; Greek allelon, one another; chemeia, pertaining to chemistry and chemical terms): 1. A chemical agent of natural origin involved in interaction between species or individuals; sometimes divided into four subgroups based on whether the emitter, the receiver, or both benefit in the interaction: allomones, kairomones, synomones and apneumones.

2. Xenomone.