Etymology
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Words related to vitreous

in vitro 
1892, scientific Latin; "in a test tube, culture dish, etc.;" literally "in glass," from Latin vitrum "glass" (see vitreous).
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vitrify (v.)

1590s, from French vitrifier (16c.), from Latin vitrum "glass" (see vitreous) + -ficare, combining form of facere "to make" (from PIE root *dhe- "to set, put"). Related: Vitrified; vitrification.

vitrine (n.)
"glass show-case," 1880, from French vitrine, from vitre "glass, window-glass," from Latin vitrum "glass" (see vitreous).
vitriol (n.)
late 14c., "sulphate of iron," from Old French vitriol (13c.), from Medieval Latin vitriolum "vitriol," noun use of neuter of vitriolus, variant of Late Latin vitreolus "of glass," from Latin vitreus "of glass, glassy," from vitrum "glass" (see vitreous). So called from its glassy appearance in certain states. Meaning "bitter or caustic feelings" first attested 1769, in reference to the corrosive properties of vitriol (when heated it produces sulfuric acid, formerly called oil of vitriol).
vitro- 
word-forming element meaning "glass," from combining form of Latin vitrum "glass" (see vitreous).
woad (n.)

Old English wad "woad," also the blue dye made from its leaves, from Proto-Germanic *waidīn (source also of Danish vaid, Old Frisian wed, Middle Dutch wede, Dutch wede, Old High German weit, German Waid "woad"), which is perhaps cognate with Latin vitrium "glass" (see vitreous), but Boutkan considers it a substratum word. Formerly much cultivated; since superseded by indigo. French guède, Italian guado are Germanic loan-words.