Etymology
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lacteal (adj.)

1650s, "pertaining to milk," earlier "milk-white" (1630s), from Latin lacteus "milky" (from lac "milk," from PIE root *g(a)lag- "milk") + -al (1). Other 17c. attempts at an adjective in English yielded lactary, lactaceous, lacteant, lacteous, lactescent, and, in a specialized sense ("milk-producing"), lactific.

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Definitions of lacteal
1
lacteal (n.)
any of the lymphatic vessels that convey chyle from the small intestine to the thoracic duct;
2
lacteal (adj.)
relating to or consisting of or producing or resembling milk;
lacteal organs
lacteal fluids
From wordnet.princeton.edu