Definition of lacteals:
(adj) :
Relating to milk.
(adj) :
(anatomy) Relating to milk production.
(n) :
(physiology, chiefly in the plural) Each of the lymphatic vessels which convey chyle from the mesentery to the thoracic duct.
(adj) :
Relating to, or containing, chyle.
(n) :
(obsolete) One of the lactiferous ducts or other components of milk-producing organs.