noun. a protuberance on a bone especially for attachment of a muscle or ligament.
noun. a large triangular muscle covering the shoulder joint and serving to abduct and flex and extend and rotate the arm.
adjective. triangular or suggesting a capital delta, with a point at the apex.
1. Noun Phrase The lower part of the deltoid attaches to the deltoid tuberosity, which is a bony bump on the upper portion of the humerus.