pap boat noun3 •(historical) A kind of sauceboat or dish. •(historical) A boat-shaped receptacle for baby food.“I have a vast inclination to get a pap-boat myself, and make him a present of it.” — 1782 •(no longer used) A large spiral East Indian marine shell (Turbinella rapa), once used by native priests to hold the oil for anointing. formspap boats