Merriam-Webster Collegiate Dictionary - lacteal

 I. adjective  Etymology: Latin lacteus of milk, from lact-, lac  Date: 1633  1. relating to, consisting of, producing, or resembling milk  2.  a. conveying or containing a milky fluid  b. of or relating to the ~s  II. noun  Date: 1680 any of the lymphatic vessels arising from the villi of the small intestine and conveying chyle to the thoracic duct