Search Result for "phytohormone": 
Wordnet 3.0

NOUN (1)

1. (botany) a plant product that acts like a hormone;
[syn: phytohormone, plant hormone, growth regulator]


The Collaborative International Dictionary of English v.0.48:

Hormone \Hor"mone\ (h[^o]r"m[=o]n), n. [From Gr. "orma`ein to excite.] 1. (Physiological Chem.) A chemical substance formed in one organ and carried in the circulation to another organ on which it exerts a specific effect on cells at a distance from the producing cells; thus, pituitary hormones produced in the brain may have effects on cells in distant parts of the body.. [Webster 1913 Suppl. +PJC] 2. (Physiological Chem.) a chemical substance, whether natural or synthetic, that functions like a hormone in a living organism. Thus, synthetic steroid hormones may be more effective than their natural counterparts. [PJC] 3. (Bot.) A substance that controls growth rate or differentiation in plants; also called phytohormone. The most well-known are the auxins that stimulate growth at the growing tips of plants, and control root formation and the dropping of leaves; and the gibberellins, which are used in agriculture to promote plant growth. [PJC]
WordNet (r) 3.0 (2006):

phytohormone n 1: (botany) a plant product that acts like a hormone [syn: phytohormone, plant hormone, growth regulator]