| 释义 |
‖ velamen|vɪˈleɪmən|
Pl. -amina.
[L. vēlāmen, f. vēlāre to cover.]
1. Bot. The outer envelope or covering of the aerial roots of some arums and orchids.
1882Vines tr. Sachs's Bot. 690 Rain or dew which moistens the root-envelope (velamen) or wounded surfaces. 1884Bower & Scott De Bary's Phaner. 227 A continuous layer of air-containing tracheides covers, as a sheath or velamen, the aerial roots of epiphytic orchids.
2. Anat. A membranous covering or integument.
In recent Dicts., which also give velamentum in the same sense. |