1 of, like, or clear as crystal.
2 Chem. & Mineral. having the structure and form of a crystal.
Phrases and idioms:
crystalline lens a transparent lens enclosed in a membranous capsule behind the iris of the eye.
Derivatives:
crystallinity n.
Etymology: ME f. OF cristallin f. L crystallinus f. Gk krustallinos (as CRYSTAL)
Useful english dictionary. 2012.