late 14c., "place for washing;" mid-15c., "act of washing," a contraction (compare launder) of Middle English lavendrie (late 13c.), from Old French lavanderie "wash-house," from Vulgar Latin *lavandaria "things to be washed," plural of lavandarium, from Latin lavare "to wash" (from PIE root *leue- "to wash"). English meaning "articles that need to be or have been laundered" is from 1916. As a verb, from 1880. Laundry list in figurative sense is from 1958.
It forms all or part of: ablution; alluvium; deluge; dilute; elution; lather; latrine; launder; lautitious; lavage; lavation; lavatory; lave; lavish; lotion; lye.
It is the hypothetical source of/evidence for its existence is provided by: Greek louein "to wash, bathe;" Latin lavare "to wash," luere "to wash;" Old Irish loathar "basin," Breton laouer "trough;" Old English leaþor "lather," læg "lye."