Wordnet 3.0
NOUN (1)
1. 
 any of the lymphatic vessels that convey chyle from the small intestine to the thoracic duct; 
ADJECTIVE (1)
1. 
 relating to or consisting of or producing or resembling milk; 
- Example: "lacteal fluids"- Example: "lacteal organs"
The Collaborative International Dictionary of English v.0.48:
Lacteal \Lac"te*al\, n. (Anat.)
   One of the lymphatic vessels which convey chyle from the
   small intestine through the mesenteric glands to the thoracic
   duct; a chyliferous vessel.
   [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Lacteal \Lac"te*al\, a. [L. lacteus milky, fr. lac, lactis,
   milk. Cf. Galaxy, Lettuce.]
   1. Pertaining to, or resembling, milk; milky; as, the lacteal
      fluid.
      [1913 Webster]
   2. (Anat. & Physiol.) Pertaining to, or containing, chyle;
      as, the lacteal vessels.
      [1913 Webster]
WordNet (r) 3.0 (2006):
lacteal
    adj 1: relating to or consisting of or producing or resembling
           milk; "lacteal fluids"; "lacteal organs"
    n 1: any of the lymphatic vessels that convey chyle from the
         small intestine to the thoracic duct
Moby Thesaurus II by Grady Ward, 1.0:
25 Moby Thesaurus words for "lacteal":
   excretory, lachrymal, lachrymose, lacrimatory, lactational,
   lacteous, lactescent, lactic, lactiferous, milch, milk, milky,
   rheumy, salivant, salivary, salivous, secretional, secretive,
   secretory, seminal, serous, sialagogic, spermatic, watering,
   watery