lactiferousEnglishOxford New American Dictionarylactiferous /ˌlakˈtif(ə)rəs, ˌlækˈtɪf(ə)rəs / ▸ adjective mainly Anatomy forming or conveying milk or milky fluid: lactiferous ducts. – ORIGIN late 17th century : from Latin lac, lact- ‘milk’ + -ferous.