Desiccation :: Desiccation (n.) The act of desiccating, or the state of being desiccated..
Desiccative :: Desiccative (n.) An application for drying up secretions.
Exsiccation :: Exsiccation (n.) The act of operation of drying; evaporation or expulsion of moisture; state of being dried up; dryness.
Exsiccative :: Exsiccative (a.) Tending to make dry; having the power of drying.