Vitra

noun, plural vitra
[vi-truh] /ˈvɪ trə/ (Show IPA)
1.
(in prescriptions) glass.

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Vitrain
noun 1. the material of which the friable, vitreous layers in banded bituminous coal are composed. noun 1. a type of coal occurring as horizontal glassy bands of a nonsoiling friable material
Vitreal lamina
vitreal lamina vit·re·al lamina (vĭt’rē-əl) or vitreous lamina n. See basal layer of choroid.
Vitrectomy
noun, plural vitrectomies. 1. the microsurgical procedure of removing the vitreous humor and replacing it with saline solution, performed to improve vision that has been impaired by opacities. vitrectomy vit·rec·to·my (vĭ-trěk’tə-mē) n. Surgical removal of the vitreous humor from the eyeball.