Definition of "deltoid"

(anatomy) The deltoid muscle, a triangular muscle on the human shoulder.  examples

(anatomy) The deltoid ligament, a triangular ligament on the human ankle.  examples

(geometry) A kite (quadrilateral having two pairs of edges of equal length, the edges of each pair touching each other at one end).  examples

(geometry) A deltoid curve (hypocycloid with three cusps).  examples

In the shape of the uppercase Greek letter delta (Δ); triangular.

1. (botany, of leaves) Of a triangular or roughly triangular shape and attached to the stem via the side.  examples

Of or pertaining to the deltoid muscle.  examples