“speculum /’sp kulert/ n. 1 (pl. specula/ -1 /)
1. Medicine a metal instrument that is used to dilate an orifice or canal in the body to allow inspection.
2. Ornithology a bright patch of plumage on the wings of certain birds, especially ducks.
3. a mirror or reflector, especially (formerly) a metallic mirror in a reflecting telescope…”
Cited from the Concise Oxford English Dictionary (Eleventh Edition)
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