noun
(botany) a plant product that acts like a hormone
• Syn: ↑phytohormone, ↑plant hormone
• Hypernyms: ↑plant product
• Hyponyms: ↑auxin, ↑gibberellin, ↑kinin, ↑cytokinin
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noun or growth substance : a substance that affects growth; especially : a synthetic substance (as naphthaleneacetic acid or dichlorophenoxyacetic acid) that resembles a naturally occurring hormone in producing a specific effect — compare auxin, growth factor
Useful english dictionary. 2012.