What is "deltoid leaf"

Deltoid \Del"toid\, a. [Gr. deltoeidh`s delta- shaped; de`lta the name of the letter [Delta] + e'i^dos form: cf. F. delto["i]de. See Delta.]

1. Shaped like the Greek [Delta] (delta); delta-shaped; triangular.

   Deltoid leaf (Bot.), a leaf in the form of a triangle with the stem inserted at the middle of the base.

   Deltoid muscle (Anat.), a large triangular muscle covering the shoulder joint, which serves to raise the arm directly upward.

2. of or pertaining to the deltoid muscle.

n. shaped like a capital delta