lactealEnglishOxford New American Dictionarylacteal /ˈlaktēəl, ˈlæktiəl / ▸ adjective of milk. ▪ Anatomy (of a vessel) conveying chyle or other milky fluid. ▸ plural noun (lacteals) Anatomy the lymphatic vessels of the small intestine which absorb digested fats. – ORIGIN mid 17th century : from Latin lacteus (from lac, lact- ‘milk’) + -al.