"stiff, flat straw hat," 1896, from boat (n.). So called for being suitable to wear while boating.
early 15c., "incapacity;" mid-15c., "any harm or injury," from Old French détriment or directly from Latin detrimentum "a rubbing off; a loss, damage, defeat," from past-participle stem of detere "to wear away," figuratively "to weaken, impair," from de "away" (see de-) + terere "to rub, wear" (from PIE root *tere- (1) "to rub, turn"). Meaning "that which causes harm or injury" is from c. 1500.
1590s, "wear or cut channels in," from channel (n.). The meaning "convey in a channel" is from 1640s. Related: Channeled; channeling.
"destroying by or as if by corrosion," late 14c., from Old French corrosif (13c.), from corroder "to wear away" (see corrode). Related: Corrosively; corrosiveness.
1839, "tall hat;" also used synechdochically for men who wear such hats; figurative meaning "swelled head" is from 1923. Drum set sense is from 1934.