01 a. Shaped like the Greek Δ (delta); delta-shaped; triangular.
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1.
Shaped like the Greek Δ (delta); delta-shaped; triangular.
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2.
of or pertaining to the deltoid muscle.
Phrases & compounds
Deltoid leaf —
a leaf in the form of a triangle with the stem inserted at the middle of the base.
Deltoid muscle —
a large triangular muscle covering the shoulder joint, which serves to raise the arm directly upward.