noun, plural specula [spek-yuh-luh] , speculums.
a mirror or reflector, especially one of polished metal, as on a reflecting telescope.
Surgery. an instrument for rendering a part accessible to observation, as by enlarging an orifice.
Ornithology. a lustrous or specially colored area on the wings of certain birds.

1590–1600; < Latin: mirror, equivalent to spec(ere) to look, behold + -ulum instrumental suffix; see -ule

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World English Dictionary
speculum (ˈspɛkjʊləm)
n , pl -la, -lums
1.  a mirror, esp one made of polished metal for use in a telescope, etc
2.  med an instrument for dilating a bodily cavity or passage to permit examination of its interior
3.  a patch of distinctive colour on the wing of a bird, esp in certain ducks
[C16: from Latin: mirror, from specere to look at]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1597, from L., lit. "mirror," from specere "to look at, view" (see scope (1)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

speculum spec·u·lum (spěk'yə-ləm)
n. pl. spec·u·lums or spec·u·la (-lə)

  1. A mirror or polished metal plate that is used as a reflector in optical instruments.

  2. An instrument that is used to dilate the opening of a body cavity for medical examination.

The American Heritage® Stedman's Medical Dictionary
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