toothpastePronunciation: /ˈtuːθpeɪst/Translate toothpaste | into French | into German | into Italian | into Spanish Definition of toothpaste noun [mass noun] a thick, soft, moist substance used on a brush for cleaning one’s teeth: a tube of toothpaste [count noun]:fluoride toothpastestoothpaste in other Oxford dictionaries Definition of toothpaste in the US English dictionary