| 单词 | positively heliotropic |
| 释义 | > as lemmaspositively heliotropic Bending or turning in a particular direction under the influence of light; pertaining to or marked by heliotropism. Said of, or in reference to, growing parts of plants, which may be positively heliotropic, i.e. bend towards the light (the most usual case), or negatively heliotropic (apheliotropic adj.), i.e. bend away from it, or diaheliotropic adj. ΘΚΠ the world > plants > part of plant > growth, movement, or curvature of parts > [adjective] > undergoing tropism geotropic1875 heliotropic1875 paratonic1875 apheliotropic1880 apogeotropic1880 nyctitropic1880 paraheliotropic1880 plagiotropic1882 phototropic1883 selenotropic1883 rheotropic1884 orthotropic1885 thermotropic1885 haptotropic1888 traumatropic1898 plagiotropous1900 aphototropic1903 orthotropous1909 1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. 676 The fact of heliotropic curvature towards the side which receives the most light. 1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. 677 There are a much smaller number which bend in the opposite direction, i.e. become concave on the shaded side. In order to distinguish between them the former are termed positively, the latter negatively heliotropic. 1880 C. Darwin & F. Darwin Power of Movement in Plants 418 Heliotropic movements are determined by the direction of the light. < as lemmas |
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