LATIN DICTIONARYLexicon Latīnum
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“crystal, crystalline” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

crystal, crystalline
crystallinus: vitreus (transparent, like glass): a crystal cup, poculum crystallinum: crystal glasses, crystallina, plur.: a crystal globe, pila crystallina (Plin., 37, 2, 10): a crystal mirror, *speculum crystallinum: crystal glass (i. e., the material itself), vitrum translucens quam proxima crystalli similitudine.
Clear; transparent: crystallinus; pellucidus; translucidus; clarus; lucidus; translucens; pellucens. [SYN. in TRANSPARENT.] The crystalline lens (in the eye), *humor translucens quam proxima crystalli similitudine (after Plin., 36, 25, 67).

Quick answer

What is the Latin word for crystal, crystalline?
The usual Latin words for “crystal, crystalline” are crystallinus, vitreus, trānspāreō; also pellūcidus, trānslūcidus, clārus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.