speculum

spec·u·lum  (spky-lm)

n. pl. spec·u·la (-l) or spec·u·lums

1. A mirror or polished metal plate used as a reflector in optical instruments.

2. An instrument for dilating the opening of a body cavity for medical examination.

3. Zoology

a. A bright, often iridescent patch of color on the wings of certain birds, especially ducks.

b. A transparent spot in the wings of some butterflies or moths.

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[Middle English, surgical speculum, from Latin, mirror, from specere, to look at; see spek- in Indo-European roots.]

Thesaurus

Noun	1.	speculum - a mirror (especially one made of polished metal) for use in an optical instrument mirror - polished surface that forms images by reflecting light
	2.	speculum - a medical instrument for dilating a bodily passage or cavity in order to examine the interior medical instrument - instrument used in the practice of medicine