| inclusion [in`klü·zhǝn] CRYSTALLOGRAPHY 1. A crystal or fragment of a crystal found in another crystal. 2. A small cavity filled with gas or liquid in a crystal. CYTOLOGY A visible product of cellular metabolism within the protoplasm. METALLURGY An impure particle, such as sand, trapped in molten metal during solidification. PETROLOGY A fragment of older rock enclosed in an igneous rock. |