crys·tal·line (krĭstə-lĭn, -līn′, -lēn′)
1. Being, relating to, or composed of crystal or crystals.
2. Resembling crystal, as in transparency or distinctness of structure or outline. See Synonyms at clear.
[Middle English cristallin, from Old French, from Latin crystallinus, from Greek krustallinos, from krustallos, ice, crystal; see kreus- in the Appendix of Indo-European roots.]
crys′tal·lini·ty (-lĭnĭ-tē) n.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.