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contusion (n.)

c. 1400, "act of beating or bruising; a bruise, an injury to the body without apparent wound or fracture," from Latin contusionem (nominative contusio) "a crushing, breaking, battering," in medical language, "a bruise," noun of action from past-participle stem of contundere "to beat, bruise, grind, crush, break to pieces," from assimilated form of com-, here perhaps an intensive prefix (see com-), + tundere "to beat" (see obtuse).

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Definitions of contusion from WordNet

contusion (n.)
an injury that doesn't break the skin but results in some discoloration;
Synonyms: bruise
contusion (n.)
the action of bruising;
the bruise resulted from a contusion
From wordnet.princeton.edu