Webster’s Revised Unabridged Dictionary · 1913
Specular
Spec′u·lar (spĕk′ū·lẽr), a. [L. specularis (cf., from the same root, specula a lookout, watchtower): cf. F. spéculaire. 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.