velamenn.
/vᵻˈleɪmən/, U.S. /vəˈleɪmən/ 1. Botany. The outer envelope or covering of the aerial roots of some arums and orchids.
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air root1826
velamen1882
1882 S. H. Vines tr. J. von Sachs Text-bk. Bot. (ed. 2) 690 Rain or dew which moistens the root-envelope (velamen) or wounded surfaces.
1884 F. O. Bower & D. H. Scott tr. H. A. de Bary Compar. Anat. Phanerogams & Ferns 227 A continuous layer of air-containing tracheides covers, as a sheath or velamen, the aerial roots of epiphytic orchids.
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2. Anatomy. A membranous covering or integument.In recent dictionaries, which also give velamentum in the same sense.
This entry has not yet been fully updated (first published 1916; most recently modified version published online December 2021).
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n.1882