toothpaste /ˈtuːθpeɪst/noun 1verb 1forms 3 noun1 •A paste, normally used with a toothbrush, for cleaning the teeth.She squeezed a bit of toothpaste onto her brush.The dentist recommended a fluoride toothpaste. verb1 •To cover, or smear, with toothpaste. formstoothpasted · toothpasting · toothpastes