kairomone /ˈkʌɪrəməʊn 
/ ▸ 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. – ORIGIN 1970s: from Greek kairos ‘advantage, opportunity’, on the pattern of pheromone.
EnglishOxford Dictionary of English
