Etymology
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desiccant (n.)

"a substance that dries the surface to which it is applied," 1670s, from Latin desiccantem (nominative desiccans), present-participle of desiccare "to make very dry," from de- "thoroughly" (see de-) + siccare "to dry" (see siccative).

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Definitions of desiccant

desiccant (n.)
a substance that promotes drying (e.g., calcium oxide absorbs water and is used to remove moisture);
Synonyms: drying agent / drier / siccative
From wordnet.princeton.edu