Etymology
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drier (n.)

late 15c. (early 14c. as a surname, Dryere; Alic le Dreyster is attested from 1292) "one who dries and bleaches cloth," agent noun from dry (v.). As "that which dries or is used in drying," 1520s. Dryer was used of machines from 1848 (drying-machine is by 1819).

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Definitions of drier

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