Drizzle

Drizzle is a word meaning to rain gently in fine mistlike drops. As a noun drizzle is often referred to as a fine, gentle, misty rain. Drizzle word origins date back to Old English and come from the word ending -drysnian, meaning to pass away or vanish. The word then passed through Middle English before entering Modern English from the word drisning, which means fall of dew.

-American Heritage College Dictionary.