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auxiliary airfield
auxiliary bishop
auxiliary boiler
auxiliary cell
auxiliary engine
auxiliary equipment
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auxiliary pump
auxiliary research submarine
Auxiliary scales
auxiliary storage
auxiliary verb
Auxiliary verbs
Auxiliatory
auxinic
Auxis Rochei
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auxotroph
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Auyuittuq National Park
Av
Ava
avadavat
Avahi

auxin definitions

WordNet (r) 3.0 (2005)

n
1: a plant hormone that promotes root formation and bud growth

Merriam Webster's

noun Etymology: International Scientific Vocabulary, from Greek auxein to increase more at eke Date: 1934 1. any of various usually acidic organic substances that promote cell elongation in plant shoots and usually regulate other growth processes (as root initiation): as a. indoleacetic acid b. any of various synthetic substances (as 2,4-D) resembling indoleacetic acid in activity and used especially in research and agriculture 2. plant hormone auxinic adjective

Britannica Concise

Any of a group of hormones that regulate plant growth, particularly by stimulating cell elongation in stems and inhibiting it in roots. Auxins influence the growth of stems toward light (phototropism) and against the force of gravity (geotropism). Auxins also play a role in cell division and differentiation, fruit development, the formation of roots from cuttings, the inhibition of lateral branching, and leaf fall. The most important naturally occurring auxin is beta-indolylacetic acid.

Oxford Reference Dictionary

n. a plant hormone that regulates growth. Etymology: G f. Gk auxo increase + -IN



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