Etymology
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crystalline (adj.)

late 14c., "made of or like crystal;" c. 1400, "resembling crystal, pure, clear, transparent," from Old French cristalin "like crystal" (Modern French crystallin) and directly from Latin crystallinus, from Greek krystallinos "of crystal," from krystallos (see crystal). Related: Crystallinity.

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Definitions of crystalline

crystalline (adj.)
consisting of or containing or of the nature of crystals;
granite is crystalline
crystalline (adj.)
distinctly or sharply outlined; "crystalline sharpness of outline"- John Buchan;
crystalline (adj.)
transmitting light; able to be seen through with clarity;
the cold crystalline water of melted snow
Synonyms: crystal clear / limpid / lucid / pellucid / transparent
From wordnet.princeton.edu