Definition of YAG
: a synthetic yttrium aluminum garnet of marked hardness and high refractive index that is used especially as a gemstone and in laser technology
Origin and Etymology of yag
yttrium aluminum garnet
First Known Use: 1964See Words from the same year
Learn More about yag
Seen and Heard
What made you want to look up YAG? Please tell us where you read or heard it (including the quote, if possible).