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Webster 1913 Edition

Noun.

[L.

exsiccatio

: cf. F.

exsiccation

The act of operation of drying; evaporation or expulsion of moisture; state of being dried up; dryness.

Sir T. Browne.

Noun.

The act or operation of drying; evaporation of moisture; dryness.

exsiccation ‎(countable and uncountable, plural exsiccations)

The act of operation of drying; evaporation or expulsion of moisture.
- 1658, Sir Thomas Brown, Pseudodoxia Epidemica, London: Edward Dod OCLC 216753971
  That which is concreted by exsiccation or expression of humidity, will be resolved by humectification, as earth, dirt and clay.