YAG

[yag]

noun

a synthetic yttrium aluminum garnet, used for infrared lasers and as a gemstone.

Origin of YAG

1960–65; y(ttrium) a(luminum) g(arnet)

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Den op in vindow he see big flag, And tenk at first he must have a yag.
The Norsk Nightingale
William F. Kirk
She washed it, and put a yag on it, and made it feel a great deal better.
Bessie and Her Friends
Joanna H. (Joanna Hooe) Mathews