(1):

(n.) The Muse that presides over eloquence and heroic poetry; mother of Orpheus, and chief of the nine Muses.

(2):

(n.) A beautiful species of humming bird (Stellula Calliope) of California and adjacent regions.

(3):

(n.) A musical instrument consisting of a series of steam whistles, toned to the notes of the scale, and played by keys arranged like those of an organ. It is sometimes attached to steamboat boilers.

(4):

(n.) One of the asteroids. See Solar.