pulvinusn.

Brit.

/pʌlˈvʌɪnəs/, U.S.

/pəlˈvaɪnəs/

Inflections: Plural pulvini.

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

Etymology: < scientific Latin pulvinus ( H. F. Link Grundlehren der Anat. u. Physiol. der Pflanzen (1807) 189) < classical Latin pulvīnus cushion, pillow, of unknown origin.

Botany.

A swollen or expanded region of a stem or petiole involved in tropic responses; spec. (in certain plants, esp. ones of the family Fabaceae ( Leguminosae)) an enlargement situated usually at the base of the petiole, consisting of motor cells capable of rapidly changing their turgor pressure and thus altering the orientation of the leaf.

ΘΚΠ

the world > plants > part of plant > leaf > petiole or leaf-stalk > [noun] > pulvinule or struma

pulvinus1832

struma1832

pulvinule1919

pulvinulus1991

1832 J. Lindley Introd. Bot. i. ii. 95 At the base of the petiole..the cellular tissue increases in quantity, and produces a protuberance or gibbosity, which Ruellius, and after him Link, called the pulvinus.

1849 J. H. Balfour Man. Bot. §156 At the place where the petiole joins the stem, there is frequently an articulation..and at the same time there exists a swelling..called pulvinus.., formed by a mass of cellular tissue.

1880 C. Darwin & F. Darwin Power of Movement in Plants 112 The summit of the petiole is developed into a pulvinus, cushion, or joint (as this organ has been variously called), like that with which many leaves are provided.

1906 Athenæum 23 June 768/3 Mimosa..has in its pulvinus a structure which allows of the free play of the leaf.

1934 C. C. Steele Introd. Plant Biochem. vii. xxvi. 315 Attempts have been made to find the cause of some of the tropisms which occur in plants, including..those which determine the rapid closing of the leaves and bending of the stems in Mimosa..—the stimulus in the latter case being transmitted by the pulvini at the base of each petiole.

1977 Amer. Jrnl. Bot. 64 1189 Leaf sheath pulvini of some grasses develop hairs..over the epidermis.

2005 Trends Plant Sci. 10 414/2 Leaves are placed and positioned by petioles to minimize self-shading; the pulvinus then rotates the lamina to face the optimal direction of light.

This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).

单词	pulvinus
释义	pulvinusn. Brit. /pʌlˈvʌɪnəs/, U.S. /pəlˈvaɪnəs/ Inflections: Plural pulvini. Origin: A borrowing from Latin. Etymon: Latin pulvinus. Etymology: < scientific Latin pulvinus ( H. F. Link Grundlehren der Anat. u. Physiol. der Pflanzen (1807) 189) < classical Latin pulvīnus cushion, pillow, of unknown origin. Botany. A swollen or expanded region of a stem or petiole involved in tropic responses; spec. (in certain plants, esp. ones of the family Fabaceae ( Leguminosae)) an enlargement situated usually at the base of the petiole, consisting of motor cells capable of rapidly changing their turgor pressure and thus altering the orientation of the leaf. ΘΚΠ the world > plants > part of plant > leaf > petiole or leaf-stalk > [noun] > pulvinule or struma pulvinus1832 struma1832 pulvinule1919 pulvinulus1991 1832 J. Lindley Introd. Bot. i. ii. 95 At the base of the petiole..the cellular tissue increases in quantity, and produces a protuberance or gibbosity, which Ruellius, and after him Link, called the pulvinus. 1849 J. H. Balfour Man. Bot. §156 At the place where the petiole joins the stem, there is frequently an articulation..and at the same time there exists a swelling..called pulvinus.., formed by a mass of cellular tissue. 1880 C. Darwin & F. Darwin Power of Movement in Plants 112 The summit of the petiole is developed into a pulvinus, cushion, or joint (as this organ has been variously called), like that with which many leaves are provided. 1906 Athenæum 23 June 768/3 Mimosa..has in its pulvinus a structure which allows of the free play of the leaf. 1934 C. C. Steele Introd. Plant Biochem. vii. xxvi. 315 Attempts have been made to find the cause of some of the tropisms which occur in plants, including..those which determine the rapid closing of the leaves and bending of the stems in Mimosa..—the stimulus in the latter case being transmitted by the pulvini at the base of each petiole. 1977 Amer. Jrnl. Bot. 64 1189 Leaf sheath pulvini of some grasses develop hairs..over the epidermis. 2005 Trends Plant Sci. 10 414/2 Leaves are placed and positioned by petioles to minimize self-shading; the pulvinus then rotates the lamina to face the optimal direction of light. This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022). < n.1832
随便看	persiflage persiflages persiflate persifleur persifleurs persimmon persimmon beer persimmon bush persimmon plum persimmon pond persimmon tree persimmon wood persimmon-coloured persimmon-skin persimmoncoloured persimmons persimmonskin persism persist persisted persistence persistence characteristic persistence of energy persistence of matter persistence of vision