deltoid

noun

1. The deltoid muscle, a triangular muscle on the human shoulder.
2. The deltoid ligament, a triangular ligament on the human ankle.
3. A kite (quadrilateral having two pairs of edges of equal length, the edges of each pair touching each other at one end).
4. A deltoid curve (hypocycloid with three cusps).

adj

1. (not-comparable)In the shape of the uppercase Greek letter delta (Δ); triangular.
2. (not-comparable)In the shape of the uppercase Greek letter delta (Δ); triangular.
3. (not-comparable)Of or pertaining to the deltoid muscle.