noun one of the asteroids. ·see solar.
2. calliope ·noun a beautiful species of humming bird (stellula calliope) of california and adjacent regions.
3. calliope ·noun the muse that presides over eloquence and heroic poetry; mother of orpheus, and chief of the nine muses.
4. calliope ·noun 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.