spec·u·lum

[spek-yuh-luhm]
noun, plural spec·u·la [-luh] , spec·u·lums.
1.
a mirror or reflector, especially one of polished metal, as on a reflecting telescope.
3.
Surgery. an instrument for rendering a part accessible to observation, as by enlarging an orifice.
4.
Ornithology. a lustrous or specially colored area on the wings of certain birds.

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

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Speculum is always a great word to know.
So is interrobang. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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World English Dictionary
speculum (ˈspɛkjʊləm) [Click for IPA pronunciation guide]
 
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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Etymonline
Word Origin & History

speculum
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
True dabbling ducks have an iridescent patch, called a speculum, on the trailing edge of their secondary feathers.
The interior of the meatus can be examined through a speculum.
Mallards have white wing bars on both edges of the blue speculum.
The speculum exam will then be completed according to usual procedures.
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