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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

substance go
the real physical matter of which a person or thing consists

material, stuff go
the tangible substance that goes into the makeup of a physical object

chemical, chemical substance go
material produced by or used in a reaction involving changes in atoms or molecules

compound, chemical compound go
(chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight

oxide go
any compound of oxygen with another element or a radical

dioxide go
an oxide containing two atoms of oxygen in the molecule

carbon dioxide, CO2, carbonic acid gas go
a heavy odorless colorless gas formed during respiration and by the decomposition of organic substances

chokedamp, blackdamp
the atmosphere in a mine following an explosion

noun.substance

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