pinnationn.

Brit.

/pᵻˈneɪʃn/, U.S.

/pəˈneɪʃ(ə)n/

Origin: Formed within English, by derivation. Etymons: pinnate adj., -ation suffix.

Etymology: < pinnate adj.: see -ation suffix.

Botany, Zoology, and Anatomy.

Pinnate condition or formation; (manner of) division into pinnae.

ΘΚΠ

the world > plants > part of plant > leaf > [noun] > leaflet > formation of

laciniation1821

lobation1840

lobing1870

pinnation1873

1873 Amer. Naturalist 7 300 None of the forms of that variable species show any approach to this in the regular pinnation and peculiar serration of the leaves.

1882 S. H. Vines tr. J. von Sachs Text-bk. Bot. (ed. 2) 212 The pinnation, like the formation of lobes, may be repeated.

1932 Jrnl. Ecol. 20 302 In rather moister portions.., both these species lose their characteristic pinnation..and their branches become very long and..straggly.

1980 Jrnl. Neurophysiol. 44 952/1 The..shortening or lengthening velocity generated by the muscle..depends on..the length and angle of pinnation of the fibers.

1996 Amer. Fern Jrnl. 86 5 The degree of sporophore pinnation varied among years in many B. hesperium and B. × watertonense plants.

This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022).

单词	pinnation
释义	pinnationn. Brit. /pᵻˈneɪʃn/, U.S. /pəˈneɪʃ(ə)n/ Origin: Formed within English, by derivation. Etymons: pinnate adj., -ation suffix. Etymology: < pinnate adj.: see -ation suffix. Botany, Zoology, and Anatomy. Pinnate condition or formation; (manner of) division into pinnae. ΘΚΠ the world > plants > part of plant > leaf > [noun] > leaflet > formation of laciniation1821 lobation1840 lobing1870 pinnation1873 1873 Amer. Naturalist 7 300 None of the forms of that variable species show any approach to this in the regular pinnation and peculiar serration of the leaves. 1882 S. H. Vines tr. J. von Sachs Text-bk. Bot. (ed. 2) 212 The pinnation, like the formation of lobes, may be repeated. 1932 Jrnl. Ecol. 20 302 In rather moister portions.., both these species lose their characteristic pinnation..and their branches become very long and..straggly. 1980 Jrnl. Neurophysiol. 44 952/1 The..shortening or lengthening velocity generated by the muscle..depends on..the length and angle of pinnation of the fibers. 1996 Amer. Fern Jrnl. 86 5 The degree of sporophore pinnation varied among years in many B. hesperium and B. × watertonense plants. This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022). < n.1873
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