I. ˈglas, ˈgläs noun
Usage: often attributive
Etymology: Middle English glas, from Old English glæs; akin to Old English geolu yellow — more at yellow
Date: before 12th century
1. : any of various amorphous materials formed from a melt by cooling to rigidity without crystallization: as
a. : a usually transparent or translucent material consisting typically of a mixture of silicates
b. : a material (as obsidian) produced by fast cooling of magma
2.
a. : something made of glass: as
(1) : tumbler ; also : glassware
(2) : mirror
(3) : barometer
(4) : hourglass
(5) : backboard 1
b.
(1) : an optical instrument or device that has one or more lenses and is designed to aid in the viewing of objects not readily seen
(2) : field glasses, binoculars — usually used in plural
c. plural : a device used to correct defects of vision or to protect the eyes that consists typically of a pair of glass or plastic lenses and the frame by which they are held in place — called also eyeglasses, spectacles
3. : the quantity held by a glass container
4. : fiberglass
• glass·ful ˈglas-ˌfu̇l noun
• glass·less -ləs adjective
II. verb
Date: 14th century
transitive verb
1.
a. : to provide with glass : glaze 1
b. : to enclose, case, or wall with glass
the sunroom was glass ed in
2. : to make glassy
3.
a. : reflect
b. : to see mirrored
4. : to look at through an optical instrument (as binoculars)
intransitive verb
: glaze I,1