DELTOID, n. 1. Triangular; an epithet applied to a muscle of the shoulder which moves the arm forwards, upwards and backwards.2. In botany, shaped somewhat like a delta or rhomb, having four angles, of which the lateral ones are less distant from the base than the others; as a deltoid leaf.Trowel-shaped, having three angles, of which the terminal one is much further from the base than the lateral ones.
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