Crys"tal*loid (kr&ibreve;s"tal*loid), a. [Gr. kry`stallos crystal + - oid.] Crystal-like; transparent like crystal.

Crys"tal*loid, n. 1. (Chem.) A body which, in solution, diffuses readily through animal membranes, and generally is capable of being crystallized; -- opposed to colloid.

2. (Bot.) One of the microscopic particles resembling crystals, consisting of protein matter, which occur in certain plant cells; -- called also protein crystal.