noun, plural spec·u·la [spek-yuh-luh] /ˈspɛk yə lə/, spec·u·lums.
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.
Origin of speculum
mirror, equivalent to spec(ere
) to look, behold + -ulum
instrumental suffix; see -ule
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for specula
Historical Examples of specula
I know of a gentleman who made a hundred of these specula with his own hands.
For they had not only to design and make the specula, but also the mountings of the mirrors as well.
In the construction of reflecting telescopes, concave mirrors, or specula, are combined with a double convex lens.
The specula are made of speculum metal, which is a composition of certain proportions of copper and tin.
I do not know whether before that the Abb Rochon had thought of using the metal Platina for the specula telescope.
British Dictionary definitions for specula
noun plural -la (-lə) or -lums
a mirror, esp one made of polished metal for use in a telescope, etc
med an instrument for dilating a bodily cavity or passage to permit examination of its interior
a patch of distinctive colour on the wing of a bird, esp in certain ducks
Word Origin for speculum
C16: from Latin: mirror, from specere to look at
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for specula
1590s, from Latin speculum, literally "mirror," from specere "to look at, view" (see scope (n.1)).
Online Etymology Dictionary, © 2010 Douglas Harper
n. pl. spec•u•lums
A mirror or polished metal plate that is used as a reflector in optical instruments.
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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