- noun a substance produced in animals in one part of the body which has a particular effect in another part of the body
- noun a plant growth factor
- noun a substance that is produced by one part of the body, especially the endocrine glands and is carried to another part of the body by the bloodstream where it has particular effects or functions
- noun a promiscuous, sexually active or successful person. This term, usually applied to males, was popular among adolescents and younger schoolchildren in Britain and Australia in the 1990s.