conspissation

From Latin conspissatio, from inspissare (“to make thick”).

conspissation (uncountable)

1. (obsolete) A thickening or making viscous; thickness

   Synonym: inspissation

   • 1647, Henry More, Infinitie of Worlds:

     Of universall life each thing's deriv'd Whater'e appeareth in corporeall fashion;
     For body's but this spirit, fixt, grosse by conspissation

2. -
   1694, R. Burthogge, Essay upon Reason:

   The Cold of the Night […] does much contribute to the Conspissation of the Spirits Vehicle.

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