orthotropicadj.
/ˌɔːθə(ʊ)ˈtrɒpɪk/, /ˌɔːθə(ʊ)ˈtrəʊpɪk/, U.S. /ˌɔrθoʊˈtrɑpɪk/ 1. Botany. Of a stem, root, etc.: having a tendency to grow in a vertical direction, upwards or downwards. More widely: growing directly towards or away from the source of a stimulus. Contrasted with plagiotropic.
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
1885 S. H. Vines in Encycl. Brit. XIX. 61/1 It is convenient, as Sachs suggests, to classify organs, according to their ultimate position, into two groups,—those which, under normal conditions, have their long axes vertical and those which have their long axes more or less inclined to the vertical; the former Sachs terms ‘orthotropic’ organs, the latter ‘plagiotropic’.
1886 S. H. Vines Lect. Physiol. Plants xvii. 425 Sachs has observed that the young primary shoot of Tropæolum majus is at first orthotropic.
1906 New Phytologist 5 227 An orthotropic part is one which is in stabile equilibrium only when its long axis is parallel to the direction of the stimulating agent.
1929 Amer. Jrnl. Bot. 16 173 There is a main orthotropic stem which develops from the terminal bud.
1951 R. C. McLean & W. R. Ivimey-Cook Textbk. Theoret. Bot. xxi. 837 Radial organs are also, for the most part, orthotropic.
1992 M. Ingrouille Diversity & Evol. Land Plants 41 The leaf arrangement..in orthotropic shoots is usually either spiral or in pairs opposite each other.
2. Engineering. Having three mutually perpendicular planes of elastic symmetry at each point.
ΘΚΠ
the world > space > shape > symmetry or regularity > [adjective] > having three planes of elastic symmetry
orthotropic1943
the world > matter > constitution of matter > softness > pliableness > [adjective] > elastic > specific
thermo-elastic1903
orthotropic1943
the world > relative properties > number > geometry > surface > [adjective] > relating to plane surfaces > characterized by or situated on specific planes
biplanar1849
coplanar1862
uniplanar1863
trisquare1889
orthotropic1943
1943 Q. Appl. Math. 1 128 Another important special case is that of an orthotropic elliptic plate bent by a linear load, for which the solution is new.
1963 P. Fern tr. S. G. Lekhnitskii Theory Elasticity of Anisotropic Elastic Body i. 21 Delta-wood and plywood can be considered as homogeneous and orthotropic in the first approximation.
1975 A. R. Cusens & R. P. Pama Bridge Deck Anal. i. 18 For long-span steel bridges, the deck is frequently a plate with longitudinal stiffeners (stringers). This form of construction is known to steel designers as an orthotropic plate.
2001 Engin. News-Record (Nexis) 247 12 The design features a shallow orthotropic steel box girder, just 3 m deep and trapezoidal in cross section.
Derivatives
orthoˈtropically adv.
ΚΠ
1956 Jrnl. Ecol. 44 311 The primary shoot, after growing for a while orthotropically, bends over and begins to creep over the substratum.
1998 Functional Ecol. 12 427/2 The subcanopy trees include saplings..that are unbranched, orthotropically branched and plagiotropically branched.
This entry has been updated (OED Third Edition, September 2004; most recently modified version published online March 2022).
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adj.1885