early 15c., "glasslike," from Latin vitreus "of glass, glassy," from vitrum "glass," which perhaps was so called for its color (compare vitrium "woad"). Vitreous humor attested from 1660s.

"glass bead used to ornament dress," 1570s, of unknown origin.

"glass lenses to help a person's sight," early 15c., from plural of spectacle. Earlier in singular form (late 14c.).

also sky-light, 1670s, "light from the sky," from sky (n.) + light (n.). The meaning "small window or opening in a roof or ceiling to admit light" is recorded from 1680s. Sky-lit (adj.) is attested by 1923.

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).

late 14c. variant of Middle English glasen "to fit with glass," also "to make shine," from glas (see glass (n.)). The form probably influenced or reinforced by glazier. Of pottery, etc., "cover with a shiny or glossy substance," from c. 1400. Related: Glazed; glazing.

coined 1871 by Lewis Carroll in "Through the Looking Glass," perhaps from chuckle and snort. Related: Chortled; chortling. As a noun, from 1903.

"one who fits window glass into frames," early 15c. variant of late 14c. glasier (late 13c. as a surname, glasyer, from glass (v.) + -er (1). Influenced by French words in -ier. Alternative glazer recorded from c. 1400 as "one who applies coatings to earthenware."

"sand-glass used for determining the time in boiling eggs," 1873, from egg (n.) + timer.

"large globular glass bottle covered with basketwork," 1753, probably ultimately from Persian qarabah "large flagon."