AUXIN Meaning of AUXIN in English [ 'ɔ:ksɪn ]■ noun a plant growth hormone which causes the elongation of cells in shoots.Origin1930s: coined in Ger. from Gk auxein 'to increase' + -in 1 . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004