crystally

adv

Etymology: From crystal + -ly.

1. Like or as a crystal.

   “It is clear, yet not crystally transparent; and, though a deep colour, is neither green nor blue[…]”

   “25 April, 1861, George Eliot, letter to Charles L. Lewes There is a crystally clear river flowing by Vidauban, called the Argent: it rushes along between a fringe of aspens and willows […]”