speculum

Inflections of 'speculum' (n):

spec•u•lum n., pl. -la -lums.

Opticsa mirror or reflector, esp. one of polished metal, as on a reflecting telescope.
MetallurgySee speculum metal.
Surgeryan instrument for rendering a part accessible to observation, as by enlarging an orifice.
Birds[Ornith.]a lustrous or specially colored area on the wings of certain birds.

Latin: mirror, equivalent. to spec(ere) to look, behold + -ulum instrumental suffix; see -ule
1590–1600

Collins Concise English Dictionary © HarperCollins Publishers::

speculum /ˈspɛkjʊləm/ n ( pl -la /-lə/, -lums)

a mirror, esp one made of polished metal for use in a telescope, etc
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

Etymology: 16th Century: from Latin: mirror, from specere to look at

'speculum' also found in these entries (note: many are not synonyms or translations):

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