spec·u·lum /ˈspɛkjələm/
 金屬鏡,反射鏡,診視器


 spec·u·lum /ˈspɛkjələm/ 名詞
 (複specula)窺器,張開器,透明隔,翼斑,翼鏡(鳥),透明斑(鱗翅目的翅),頸斑(鱗翅目),金屬鏡,反射鏡,響板(直翅目前翅的基部)


 Spec·u·lum n.; pl. L. Specula E. Speculum
 1. A mirror, or looking-glass; especially, a metal mirror, as in Greek and Roman archaeology.
 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.

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 speculum
      n 1: a mirror (especially one made of polished metal) for use in
           an optical instrument
      2: a medical instrument for dilating a bodily passage or cavity
         in order to examine the interior
      [also: specula (pl)]