Definition of "deltoid" in English

noun

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

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

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

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

adjective

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

2. Of or pertaining to the deltoid muscle.