say it: DRAHY-ur
drier is a noun meaning "a substance that promotes drying (e.g., calcium oxide absorbs water and is used to remove moisture)". It carries 2 recorded senses.
a substance that promotes drying (e.g., calcium oxide absorbs water and is used to remove moisture)
an appliance that removes moisture
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for drier come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.