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late 14c., from Old French cristalin "like crystal" (Modern French crystallin), from Latin crystallinus, from Greek krystallinos "of crystal," from krystallos (see crystal).
crystalline crys·tal·line (krĭs'tə-lĭn, -līn', -lēn')adj.
Being, relating to, or composed of crystal or crystals.
Resembling crystal, as in transparency or distinctness of structure or outline.