spec·u·lum (spěkyə-ləm)
n. pl. spec·u·la (-lə) or spec·u·lums
► A mirror or polished metal plate used as a reflector in optical instruments.
► An instrument for dilating the opening of a body cavity for medical examination.
► Zoology.
■ A bright, often iridescent patch of color on the wings of certain birds, especially ducks.
■ A transparent spot in the wings of some butterflies or moths.

[TahlilGaran] American Dictionary ▲

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

[TahlilGaran] American Dictionary ▲