Dryer

google

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Middle English (in the sense ‘person who dries’): from the verb dry + -er1.

wiktionary

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From Middle English driere, dreyere(“one who dries”), equivalent to dry +‎ -er(“agent suffix”).

dry +‎  -er(“comparative suffix”)

etymonline

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dryer (n.)

agent noun from dry (v.); see drier.