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
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The interior of the meatus can be examined through a speculum.
The speculum exam will then be completed according to usual procedures.
Mallards have white wing bars on both edges of the blue speculum.
True dabbling ducks have an iridescent patch, called a speculum, on the trailing edge of their secondary feathers.
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