outpocketingn.
/ˈaʊtpɒkᵻtɪŋ/, U.S. /ˈaʊtˌpɑkədɪŋ/ Biology.
An outward growth or movement of part of a surface so as to form a pocket-like or sac-like cavity; the cavity so formed.
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outpocketing1900
1900 Science 2 Feb. 174/1 The gills, which are the most characteristic feature of the worm, are out-pocketings of the body wall.
1924 L. B. Arey Developmental Anat. i. 8 Circumscribed folds..produce (a) evaginations, or out-pocketings, and (b) invaginations, or in-pocketings.
1971 Nature 16 Apr. 472/2 The glands arise as an outpocketing of the vagina.
1992 Cambr. Encycl. Human Evol. (1994) i. iii. 28/2 Like the internal carotid artery of anthropoids, that of tarsiers is partly enclosed by an air-filled outpocketing from the front of the middle-ear cavity.
This entry has been updated (OED Third Edition, December 2004; most recently modified version published online March 2022).
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n.1900