deltoid

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deltoid

[′del‚tȯid]
(anatomy)
The large triangular shoulder muscle; originates on the pectoral girdle and inserts on the humerus.
(biology)
Triangular in shape.
(mathematics)
The plane curve traced by a point on a circle while the circle rolls along the inside of another circle whose radius is three times as great.
A concave quadrilateral with two pairs of adjacent equal sides. Also known as Steiner's hypocycloid tricuspid.