- [Class. Myth] The Muse that presides over eloquence and heroic poetry; mother of Orpheus, and chief of the nine Muses.
- [Astron] One of the asteroids. See Solar.
- 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.
- [Zoöl] A beautiful species of humming bird (Stellula Calliope) of California and adjacent regions.
Etymology: L. Calliope, Gr. Kallio`ph, lit, the beautiful-voiced; pref. kalli-from kalo`s beautiful) + 'o`ps 'opo`s, voice