Etymology
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speculum (n.)

1590s, in surgery and medicine, "instrument for rendering a part accessible to observation," from Latin speculum "reflector, looking-glass, mirror" (also "a copy, an imitation"), from specere "to look at, view" (from PIE root *spek- "to observe"). As a type of telescope attachment from 1704.

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Definitions of speculum

speculum (n.)
a mirror (especially one made of polished metal) for use in an optical instrument;
speculum (n.)
a medical instrument for dilating a bodily passage or cavity in order to examine the interior;
From wordnet.princeton.edu