[crys.tal.line] adj [ME cristallin, fr. MF & L; MF, fr. L crystallinus, fr. Gk krystallinos, fr. krystallos] (15c) 1: resembling crystal: as a: strikingly clear or sparkling "~ air" "a ~ lake" b: clear-cut
2: made of crystal: composed of crystals
3: constituting or relating to a crystal -- crys.tal.lin.i.ty n