crystalline

Etymology

From Middle English cristallyn, cristallyne, from Old French cristallin, from Latin crystallinus, from Ancient Greek κρυστάλλινος (krustállinos), from κρύσταλλος (krústallos, “crystal”).

adj

1. Of, relating to, or composed of crystals.
2. (chemistry) Having a regular three-dimensional molecular structure.
3. Resembling crystal in being clear and transparent.
4. Pure.
   not in his favoured midfield role, either but as a false No 9: the sort of role Guardiola only hands to his chosen, crystalline few: Mario Götze at Bayern Munich (less successfully), Lionel Messi at Barcelona (a little more so). 7 August 2020, Jonathan Liew, “Phil Foden stars to offer Manchester City glimpse of multiple futures”, in The Guardian

noun

1. (obsolete) Any crystalline substance.
2. (obsolete) aniline