orthotropismn.
/ˌɔːθə(ʊ)ˈtrəʊpɪz(ə)m/, U.S. /ˌɔrθoʊˈtrɑˌpɪz(ə)m/ Botany.
The condition of being orthotropic; tendency to grow in a vertical direction, upwards or downwards.
ΘΚΠ
the world > plants > part of plant > growth, movement, or curvature of parts > [noun] > tropisms
heliotropism1854
geotropism1873
apheliotropism1880
apogeotropism1880
nyctitropism1880
paraheliotropism1881
hydrotropism1882
selenotropism1883
selenotropy1883
rheotropism1884
orthotropism1885
plagiotropism1886
geotropy1888
haptotropism1888
aerotropism1889
phototropy1892
autotropism1897
plagiotropy1898
thermotropism1898
traumatropism1898
phototropism1899
gravitropism1969
1885 S. H. Vines in Encycl. Brit. XIX. 61/1 Orthotropism is then mainly due to negative geotropism.
1942 New Phytologist 41 11 These changes are supposed to be due to the orthotropism of some transverse ‘elements’.
1995 Functional Ecol. 9 211/2 Possible reasons for this absence..include..the competitive inferiority of plagiotropism to orthotropism under better illumination.
This entry has been updated (OED Third Edition, September 2004; most recently modified version published online March 2022).
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n.1885