The Collaborative International Dictionary of English v.0.48:

Sciatheric \Sci`a*ther"ic\, Sciatherical \Sci`a*ther"ic*al\, a.
   [Gr. ?, fr. ? a sundial; ? a shadow + ? to hunt, to catch.]
   Belonging to a sundial. [Obs.] --Sir T. Browne.
   [1913 Webster] -- Sci`a*ther"ic*al*ly, adv. [Obs.] --J.
   Gregory.
   [1913 Webster]