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1. Geology a solid fragment, liquid globule, or pocket of gas enclosed in a mineral or rock
a. the relation between two sets that obtains when all the members of the first are members of the second.
b. strict or proper inclusion the relation that obtains between two sets when the first includes the second but not vice versa.
3. Engineering a foreign particle in a metal, such as a particle of metal oxide
(cell and molecular biology)
A visible product of cellular metabolism within the protoplasm.
A crystal or fragment of a crystal found in another crystal.
A small cavity filled with gas or liquid in a crystal.
An impure particle, such as sand, trapped in molten metal during solidification.
A fragment of older rock enclosed in an igneous rock.
The presence of foreign matter in a finished material.