The Collaborative International Dictionary
protein crystal
Crystalloid \Crys"tal*loid\, n.
(Chem.) A body which, in solution, diffuses readily through animal membranes, and generally is capable of being crystallized; -- opposed to colloid.
(Bot.) One of the microscopic particles resembling crystals, consisting of protein matter, which occur in certain plant cells; -- called also protein crystal.
Usage examples of "protein crystal".
There were experiments in protein crystal growth, and the diffusion of bacteria in microgravity conditions, and a chunky arrangement called the heat pipe performance experiment, a dry engineering test of the diffusion of heat from hot spots on pipes and ducts in microgravity.