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scapula (n.)

"shoulder blade," 1570s, Modern Latin, from Late Latin scapula "shoulder," from Latin scapulae (plural) "shoulders, shoulder blades," perhaps originally "spades, shovels," on notion of similar shape, but animal shoulder blades might have been used as scraping tools in primitive times, from PIE *skap-, variant of *skep- "to cut, scrape" (see scabies).

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Definitions of scapula from WordNet

scapula (n.)
either of two flat triangular bones one on each side of the shoulder in human beings;
Synonyms: shoulder blade / shoulder bone
From wordnet.princeton.edu