deciduityn.

Brit.

/dɛsᵻˈdjuːᵻti/,

/dɛsᵻˈdʒuːᵻti/, U.S.

/ˌdɛsəˈdʒ(j)uədi/

Origin: A borrowing from Latin. Etymon: Latin deciduitas.

Etymology: < post-classical Latin deciduitas tendency to decline (1773 or earlier) < classical Latin dēciduus tending to fall, falling (see deciduous adj.) + -tās (see -ty suffix¹; compare -ity suffix).

Chiefly Botany. Now rare.

The state of being deciduous; deciduousness.

ΚΠ

1816 P. Keith Syst. Physiol. Bot. I. 131 In the flower of the genus Rosa,..the segments, at least of what is usually called the calyx, are deciduous, which deciduity seems to point out to us the natural line of distinction between the calyx and receptacle.

1898 M. M. Dowie Crook of Bough x. 84 The smoking-room might have been figured as the garden of a Gargantuan thistle-plant in its autumn deciduity.

1931 W. A. Dayton Important Western Browse Plants 47 (caption) Fruit of same showing deciduity of sepals and styles.

1997 A. J. Miklausen Brown Algal Origin Land Plants vi. 99 Other fucalean frond derivatives readily evident in vascular land plants are bilaterality, dioecism, deciduity, seasonality, [etc.].

This entry has been updated (OED Third Edition, June 2015; most recently modified version published online March 2022).

单词	deciduity
释义	deciduityn. Brit. /dɛsᵻˈdjuːᵻti/, /dɛsᵻˈdʒuːᵻti/, U.S. /ˌdɛsəˈdʒ(j)uədi/ Origin: A borrowing from Latin. Etymon: Latin deciduitas. Etymology: < post-classical Latin deciduitas tendency to decline (1773 or earlier) < classical Latin dēciduus tending to fall, falling (see deciduous adj.) + -tās (see -ty suffix¹; compare -ity suffix). Chiefly Botany. Now rare. The state of being deciduous; deciduousness. ΚΠ 1816 P. Keith Syst. Physiol. Bot. I. 131 In the flower of the genus Rosa,..the segments, at least of what is usually called the calyx, are deciduous, which deciduity seems to point out to us the natural line of distinction between the calyx and receptacle. 1898 M. M. Dowie Crook of Bough x. 84 The smoking-room might have been figured as the garden of a Gargantuan thistle-plant in its autumn deciduity. 1931 W. A. Dayton Important Western Browse Plants 47 (caption) Fruit of same showing deciduity of sepals and styles. 1997 A. J. Miklausen Brown Algal Origin Land Plants vi. 99 Other fucalean frond derivatives readily evident in vascular land plants are bilaterality, dioecism, deciduity, seasonality, [etc.]. This entry has been updated (OED Third Edition, June 2015; most recently modified version published online March 2022). < n.1816
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