Source : Webster's Revised Unabridged Dictionary (1913)

Specular \Spec"u*lar\, a. [L. specularis (cf., from the same
   root, specula a lookout, watchtower): cf. F. sp['e]culaire.
   See {Speculum}.]
   1. Having the qualities of a speculum, or mirror; having a
      smooth, reflecting surface; as, a specular metal; a
      specular surface.

   2. (Med.) Of or pertaining to a speculum; conducted with the
      aid of a speculum; as, a specular examination.

   3. Assisting sight, as a lens or the like. [Obs.]

            Thy specular orb Apply to well-dissected kernels;
            lo! In each observe the slender threads Of
            first-beginning trees.                --J. Philips.

   4. Affording view. [R.] ``Look once more, ere we leave this
      specular mount.'' --Milton.

   {Specular iron}. (Min.) See {Hematite}.

Source : WordNet®

specular
     adj : capable of reflecting light like a mirror; "mirrorlike
           surface of the lake"; "a specular metal" [syn: {mirrorlike}]