crystalloid

Short definition from Wiktionary

Noun

1. 1
   Any substance that can be crystallized from solution; a water-soluble crystalline substance that can diffuse through a semipermeable membrane, as opposed to a colloid which cannot.
2. 2
   One of the microscopic particles resembling crystals, consisting of protein matter, which occur in certain plant cells.

Adjective

1. 1
   Crystal-like; transparent like crystal, or shaped like a crystal.