orthotropousadj.

Brit.

/ɔːˈθɒtrəpəs/, U.S.

/ɔrˈθɑtrəpəs/

Origin: A borrowing from French, combined with an English element. Etymons: French orthotrope , -ous suffix.

Etymology: < French orthotrope (1808 in the source translated in quot. 1819 at sense 1; < ortho- ortho- comb. form + -trope -trope comb. form) + -ous suffix.With sense 1 compare homotropous adj., atropous adj. With sense 2 compare earlier orthotropic adj.

Botany.

1. Originally (of an embryo): having the radicle directed towards the hilum; = homotropous adj. Later (of an ovule): developed in an upright position from the placenta, so that the micropyle is at the end opposite the base; = atropous adj.

ΘΚΠ

the world > plants > part of plant > reproductive part(s) > seed > [adjective] > of parts > relating to embryo or radicle

rostellate1800

orthotropous1819

peritropal1819

radicular1819

rostelliform1819

homotropous1829

heterotropous1830

heterotropal1832

axile1839

amphitropous1841

homotropal1844

rostellara1845

amphitropal1847

peritropous1849

polyembryonate1864

polyembryonic1864

proembryonic1875

the world > life > biology > biological processes > procreation or reproduction > reproductive substances or cells > [adjective] > ovum > types of ovum

orthotropal1832

meroblastic1864

periblastic1876

holoblastic1879

orthotropous1880

telolecithal1880

progamous1885

teleplasmic1886

triovulate1891

1819 J. Lindley tr. L.-C. Richard Observ. Struct. Fruits & Seeds 35 There are some other epithets which are applied to the embryo with respect to its direction. It is homotropous, when it has the same direction as the seed—orthotropous, when like the last, but straight.

1830 J. Lindley Introd. Nat. Syst. Bot. 236 The embryo is certainly orthotropous in Streptocarpus Rexii.

1880 A. Gray Struct. Bot. vi. §8. 278 Orthotropous, or straight ovule, is the simplest but least common species, being that in which the chalaza is at the evident base, and the orifice at the opposite extremity, the whole ovule straight and..symmetrical. Atropous..is a later and etymologically much better name.

1908 B. L. Robinson & M. L. Fernald Gray's New Man. Bot. (ed. 7) 353 Polygonaceae (Buckwheat Family)..the flowers mostly perfect, with..a 1-celled ovary bearing 2 or 3 styles..and a single erect orthotropous seed.

1935 Bull. Torrey Bot. Club 62 94 When first differentiated the ovules are almost orthotropous, but they soon become bent in a horizontal plane so that the micropyle is approximately at right angles to the point of attachment.

1977 K. Esau Anat. Seed Plants xxi. 417/1 During the development of the integuments the ovule may remain upright (atropous or orthotropous ovule) or become inverted (anatropous ovule).

2. = orthotropic adj. 1. rare.

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

1909 Webster's New Internat. Dict. Eng. Lang. Orthotropous a. Bot.,..= orthotropic.

1965 P. Bell & D. Coombe tr. Strasburger's Textbk. Bot. (new ed.) 125 If the main axis is vertical it is said to be orthotropous and the plant upright.

This entry has been updated (OED Third Edition, September 2004; most recently modified version published online March 2022).

单词	orthotropous
释义	orthotropousadj. Brit. /ɔːˈθɒtrəpəs/, U.S. /ɔrˈθɑtrəpəs/ Origin: A borrowing from French, combined with an English element. Etymons: French orthotrope , -ous suffix. Etymology: < French orthotrope (1808 in the source translated in quot. 1819 at sense 1; < ortho- ortho- comb. form + -trope -trope comb. form) + -ous suffix.With sense 1 compare homotropous adj., atropous adj. With sense 2 compare earlier orthotropic adj. Botany. 1. Originally (of an embryo): having the radicle directed towards the hilum; = homotropous adj. Later (of an ovule): developed in an upright position from the placenta, so that the micropyle is at the end opposite the base; = atropous adj. ΘΚΠ the world > plants > part of plant > reproductive part(s) > seed > [adjective] > of parts > relating to embryo or radicle rostellate1800 orthotropous1819 peritropal1819 radicular1819 rostelliform1819 homotropous1829 heterotropous1830 heterotropal1832 axile1839 amphitropous1841 homotropal1844 rostellara1845 amphitropal1847 peritropous1849 polyembryonate1864 polyembryonic1864 proembryonic1875 the world > life > biology > biological processes > procreation or reproduction > reproductive substances or cells > [adjective] > ovum > types of ovum orthotropal1832 meroblastic1864 periblastic1876 holoblastic1879 orthotropous1880 telolecithal1880 progamous1885 teleplasmic1886 triovulate1891 1819 J. Lindley tr. L.-C. Richard Observ. Struct. Fruits & Seeds 35 There are some other epithets which are applied to the embryo with respect to its direction. It is homotropous, when it has the same direction as the seed—orthotropous, when like the last, but straight. 1830 J. Lindley Introd. Nat. Syst. Bot. 236 The embryo is certainly orthotropous in Streptocarpus Rexii. 1880 A. Gray Struct. Bot. vi. §8. 278 Orthotropous, or straight ovule, is the simplest but least common species, being that in which the chalaza is at the evident base, and the orifice at the opposite extremity, the whole ovule straight and..symmetrical. Atropous..is a later and etymologically much better name. 1908 B. L. Robinson & M. L. Fernald Gray's New Man. Bot. (ed. 7) 353 Polygonaceae (Buckwheat Family)..the flowers mostly perfect, with..a 1-celled ovary bearing 2 or 3 styles..and a single erect orthotropous seed. 1935 Bull. Torrey Bot. Club 62 94 When first differentiated the ovules are almost orthotropous, but they soon become bent in a horizontal plane so that the micropyle is approximately at right angles to the point of attachment. 1977 K. Esau Anat. Seed Plants xxi. 417/1 During the development of the integuments the ovule may remain upright (atropous or orthotropous ovule) or become inverted (anatropous ovule). 2. = orthotropic adj. 1. rare. 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 1909 Webster's New Internat. Dict. Eng. Lang. Orthotropous a. Bot.,..= orthotropic. 1965 P. Bell & D. Coombe tr. Strasburger's Textbk. Bot. (new ed.) 125 If the main axis is vertical it is said to be orthotropous and the plant upright. This entry has been updated (OED Third Edition, September 2004; most recently modified version published online March 2022). < adj.1819
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