Crystalloid

Webster's Dictionary of the English Language

·adj Crystal-like; transparent like crystal.

II. Crystalloid ·noun A body which, in solution, diffuses readily through animal membranes, and generally is capable of being crystallized;

— opposed to colloid.

III. Crystalloid ·noun One of the microscopic particles resembling crystals, consisting of protein matter, which occur in certain plant cells;

— called also protein crystal.