specular

adjective4

1. •
   Pertaining to mirrors; mirror-like, reflective.

   • a perfect likeness would rather suggest a specular, and hence speculatory, phenomenon [...]. — 1969
2. •
   Of or relating to a speculum; conducted with the aid of a speculum.
3. •
   (literary) Offering an expansive view; picturesque.

   • Calm as the Universe, from specular towers / Of heaven contemplated by Spirits pure. — 1833
4. •
   Assisting sight, like a lens etc.

   • Thy specular orb / Apply to well-dissected kernels; lo! / In each observe the slender threads / Of first-beginning trees. — 1708