kairomone
/ˈkaɪrəʊməʊn/noun
- Biology a chemical substance emitted by an organism and detected by another of a different species which gains advantage from this, e.g. a parasite seeking a host【生】种间（外）激素, 利它外激素, 利它信息素。
词源
late 20th cent.: from Greek kairos 'advantage, opportunity', on the pattern of pheromone .