Pronunciation: (spek'yu-lum), [key]
—pl. -laPronunciation: (-lu), [key] -lums.
1. a mirror or reflector, esp. one of polished metal, as on a reflecting telescope.
2. See speculum metal.
3. Surg.an instrument for rendering a part accessible to observation, as by enlarging an orifice.
4. Ornith.a lustrous or specially colored area on the wings of certain birds.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.