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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

matter go
that which has mass and occupies space

solid go
matter that is solid at room temperature and pressure

glass go
a brittle transparent solid with irregular atomic structure

optical glass go
clear homogeneous glass of known refractive index

optical flint, flint glass
optical glass of high dispersion and high refractive index

noun.substance

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