a mirror made of glass with a metallic or amalgam backing.
the glass used in a mirror.
anything used as a mirror, as highly polished metal or a reflecting surface.
Origin of looking glass
First recorded in 1520–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a mirror, esp a ladies' dressing mirror
with normal or familiar circumstances reversed; topsy-turvya looking-glass world
Word Origin for looking glass
sense 2 in allusion to Lewis Carroll's Through the Looking-Glass
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