circumnutationn.

/ˌsəːkəmnjuːˈteɪʃən/

Etymology: noun of action < circumnutate v.: see nutation n.

Botany.

A movement characteristic of growing plants, due to increased growth at different points round the axis in succession, whereby the growing part (e.g. the apex of a stem) describes a more or less circular spiral path. (See nutation n.)

ΘΚΠ

the world > plants > part of plant > growth, movement, or curvature of parts > [noun] > torsion or nutation

intorsion1760

resupination1760

nutation1789

torsion1875

circumnutation1880

1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. iii. iv. 766 Curvatures..caused by the unequal growth of different sides of an organ may be called Nutations..It is common for the apices of erect stems above the curved growing part to move round in a circle or ellipse, the region of most active growth moving gradually, as it were, round the axis. This kind of nutation may be termed a Revolving Nutation.]

1880 C. Darwin & F. Darwin Power of Movement in Plants 1 This movement has been called by Sachs ‘revolving nutation’; but we have found it much more convenient to use the terms circumnutation and circumnutate.

1882 Garden 14 Jan. 32/3 The method of climbing by twiners was a modification of the property of ‘circumnutation’.

Derivatives

circumˈnutatory adj. pertaining to circumnutation.

ΘΚΠ

the world > plants > part of plant > growth, movement, or curvature of parts > [adjective] > turned, twisted, or nutating

tort1765

resupinate1776

introrsal1831

introrse1842

sinistrorse?1850

torsive1866

circumnutating1880

circumnutatory1880

nutating1881

1880 Athenæum 18 Dec. 817/2 The movements of climbing plants..are modifications of this circumnutatory tendency.

This entry has not yet been fully updated (first published 1889; most recently modified version published online March 2019).

单词	circumnutation
释义	circumnutationn. /ˌsəːkəmnjuːˈteɪʃən/ Etymology: noun of action < circumnutate v.: see nutation n. Botany. A movement characteristic of growing plants, due to increased growth at different points round the axis in succession, whereby the growing part (e.g. the apex of a stem) describes a more or less circular spiral path. (See nutation n.) ΘΚΠ the world > plants > part of plant > growth, movement, or curvature of parts > [noun] > torsion or nutation intorsion1760 resupination1760 nutation1789 torsion1875 circumnutation1880 1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. iii. iv. 766 Curvatures..caused by the unequal growth of different sides of an organ may be called Nutations..It is common for the apices of erect stems above the curved growing part to move round in a circle or ellipse, the region of most active growth moving gradually, as it were, round the axis. This kind of nutation may be termed a Revolving Nutation.] 1880 C. Darwin & F. Darwin Power of Movement in Plants 1 This movement has been called by Sachs ‘revolving nutation’; but we have found it much more convenient to use the terms circumnutation and circumnutate. 1882 Garden 14 Jan. 32/3 The method of climbing by twiners was a modification of the property of ‘circumnutation’. Derivatives circumˈnutatory adj. pertaining to circumnutation. ΘΚΠ the world > plants > part of plant > growth, movement, or curvature of parts > [adjective] > turned, twisted, or nutating tort1765 resupinate1776 introrsal1831 introrse1842 sinistrorse?1850 torsive1866 circumnutating1880 circumnutatory1880 nutating1881 1880 Athenæum 18 Dec. 817/2 The movements of climbing plants..are modifications of this circumnutatory tendency. This entry has not yet been fully updated (first published 1889; most recently modified version published online March 2019). < n.1880
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