dandruff UK /ˈdændɹʌf/US /ˈdændɹəf/noun 1verb 1forms 3 noun1 •scaly white dead skin flakes from the human scalp; Pityriasis capitisDandruff is on my collar again. verb1 •To fall or cover with white flakes, like dandruff.The toaster is broken and salt is dandruffing my wool sweater. — 2014 formsdandruffed · dandruffing · dandruffs