Definition of crystally in US English:

crystally

adjective

  • Crystalline, resembling or composed of crystal.

adverb

  • So as to be suggestive of crystal, especially in transparency.

Origin

Mid 16th century; earliest use found in Robert Record (c1512–1558), mathematician. From crystal + -ly<br>late 17th century; earliest use found in Ezekiel Hopkins (1634–1690), bishop of Derry. From crystal + -ly.