Auxin
a cl-ss of substances that in minute amounts regulate or modify the growth of plants, especially root formation, bud growth, and fruit and leaf drop.
noun
any of various plant hormones, such as indoleacetic acid, that promote growth and control fruit and flower development. synthetic auxins are widely used in agriculture and horticulture
n.
plant growth hormone, 1934, from german (1931), from greek auxein “to increase” (see augment) + chemical suffix -in (2).
auxin
(ôk’sĭn)
any of various hormones or similar substances that promote and regulate the growth and development of plants. auxins are produced in the meristem of shoot tips and move down the plant, causing various effects. auxins cause the cells below the shoot apex to expand or elongate, and this (rather than cell division) is what causes the plant to increase in height. in woody plants, auxins also stimulate cell division in the cambium, which produces vascular tissue. auxins inhibit the growth of lateral buds so that the plant grows upwards more than outwards. they can be produced artificially in laboratories for such purposes as speeding plant growth and regulating how fast fruit will ripen.
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any radical or group of atoms that intensifies the color of a substance. historical examples notable differences attend the neutralization of the chromophoric and auxochromic groups. encyclopaedia britannica, 11th edition, volume 6, slice 1 various noun a group of atoms that can be attached to a chromogen to convert it into a dye