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Definition of: deltoid
(del′toid) noun
1. Anat. A triangular muscle of the shoulder and upper arm.
2. Geom. A quadrilateral formed by two unequal isosceles triangles set base to base.
—adjective
1. Shaped like a delta; triangular.
2. Of or pertaining to the deltoid. [<Gk. deltoeidēs triangular <delta the letter Δ + eidos form]
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