caligation

Borrowed from Latin caligatio, from caligare (“to emit vapour, to be dark”), from caligo (“mist, darkness”).

caligation (uncountable)

1. (obsolete, rare) dimness; cloudiness
   • 1646/50, Sir Thomas Browne, Pseudodoxia Epidemica:

     Now instead of a diminution or imperfect vision in the Moll, we affirm an abolition or totall privation; in stead of caligation or dimnesse, we conclude a cecity or blindness, which hath been frequently inferred concerning other animals;

• “caligation”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.

• glaciation