[ ahy-glas, ahy-glahs ]
/ ˈaɪˌglæs, ˈaɪˌglɑs /


eyeglasses, glass(def 5).
a single lens used to aid vision, especially one worn or carried on the person; monocle.
an eyepiece.
an eyecup.



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Question 1 of 7

Origin of eyeglass

First recorded in 1605–15; eye + glass

Definition for eyeglasses (2 of 2)

[ glas, glahs ]
/ glæs, glɑs /



made of glass: a glass tray.
furnished or fitted with panes of glass; glazed.

verb (used with object)

Origin of glass

before 900; Middle English glas (noun), Old English glæs; cognate with Dutch, German Glas


glass·less, adjectiveglass·like, adjectivenon·glass, adjectiveun·glassed, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for eyeglasses

British Dictionary definitions for eyeglasses (1 of 4)

/ (ˈaɪˌɡlɑːsɪz) /

pl n

mainly US another word for spectacles

British Dictionary definitions for eyeglasses (2 of 4)

/ (ˈaɪˌɡlɑːs) /


a lens for aiding or correcting defective vision, esp a monocle
another word for eyepiece

British Dictionary definitions for eyeglasses (3 of 4)

/ (ɡlɑːs) /


verb (tr)

to cover with, enclose in, or fit with glass
informal to hit (someone) in the face with a glass or a bottle

Derived forms of glass

glassless, adjectiveglasslike, adjective

Word Origin for glass

Old English glæs; related to Old Norse gler, Old High German glas, Middle High German glast brightness; see glare 1

British Dictionary definitions for eyeglasses (4 of 4)

/ (ɡlɑːs) /


Philip. born 1937, US composer noted for his minimalist style: his works include Music in Fifths (1970), Akhnaten (1984), The Voyage (1992), and Monsters of Grace (1998); his film music includes scores for Kundun (1998), The Truman Show (1999), and The Hours (2002)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for eyeglasses (1 of 2)

[ īglăs′ ]


eyeglasses Glasses for the eyes.
A single lens in a pair of glasses; a monocle.

Medical definitions for eyeglasses (2 of 2)

[ glăs ]


Any of a large class of materials with highly variable mechanical and optical properties that solidify from the molten state without crystallization, are typically made by silicates fusing with boric oxide, aluminum oxide, or phosphorus pentoxide, are generally hard, brittle, and transparent or translucent, and are considered to be supercooled liquids rather than true solids.
Something usually made of glass, such as a window, mirror, or drinking vessel.
glasses A pair of lenses mounted in a light frame, used to correct faulty vision or protect the eyes.spectacles
A device, such as a monocle or spyglass, containing a lens or lenses and used as an aid to vision.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for eyeglasses

[ glăs ]

A usually transparent or translucent material that has no crystalline structure yet behaves like a solid. Common glass is generally composed of a silicate (such as silicon oxide, or quartz) combined with an alkali and sometimes other substances. The glass used in windows and windshields, called soda glass, is made by melting a silicate with sodium carbonate (soda) and calcium oxide (lime). Other types of glass are made by adding other chemical compounds. Adding boron oxide causes some silicon atoms to be replaced by boron atoms, resulting in a tougher glass that remains solid at high temperatures, used for cooking utensils and scientific apparatuses. Glass used for decorative purposes often has iron in it to alter its optical properties.

A Closer Look

Common sand and glass are both made primarily of silicon and oxygen, yet sand is opaque and glass is transparent. Glass owes its transparency partly to the fact that it is not a typical solid. On the molecular level, solids usually have a highly regular, three-dimensional crystalline structure; the regularities distributed throughout the solid act as mirrors that scatter incoming light. Glass, however, consists of molecules which, though relatively motionless like a typical solid, are not arranged in regular patterns and thus exhibit little scattering; light passes directly through. At a specific temperature, called the melting point, the intermolecular forces holding together the components of a typical solid can no longer maintain the regular structure, which then breaks down, and the material undergoes a phase transition from solid to liquid. The phase transition in glass, however, depends on how quickly the glass is heated (or how quickly it cools), due to its irregular solid structure.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Idioms and Phrases with eyeglasses


The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.