crystally

comparative more crystally · superlative most crystally

1. Like or as a crystal.

   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 […]

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

   1820, Jane Waldie, Sketches descriptive of Italy in the years 1816 and 1817, volume 4, page 320