Word:

Speculum

Spec´u`lum
n.1.A mirror, or looking-glass; especially, a metal mirror, as in Greek and Roman archæology.
2.A reflector of polished metal, especially one used in reflecting telescopes. See Speculum metal, below.
3.(Surg.) An instrument for dilating certain passages of the body, and throwing light within them, thus facilitating examination or surgical operations.
4.(Zool.) A bright and lustrous patch of color found on the wings of ducks and some other birds. It is usually situated on the distal portions of the secondary quills, and is much more brilliant in the adult male than in the female.
Speculum metal
a hard, brittle alloy used for making the reflectors of telescopes and other instruments, usually consisting of copper and tin in various proportions, one of the best being that in which there are 126.4 parts of copper to 58.9 parts of tin, with sometimes a small proportion of arsenic, antimony, or zinc added to improve the whiteness.
Noun1.speculum - a mirror (especially one made of polished metal) for use in an optical instrument
2.speculum - a medical instrument for dilating a bodily passage or cavity in order to examine the interior
mirror
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-- Speculum --
Speculum metal
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