The Collaborative International Dictionary of English v.0.48:

Lactiferous \Lac*tif"er*ous\, a. [l. lac, lactis, milk +
   -ferous: cf. F. lactif[`e]re.]
   Bearing or containing milk or a milky fluid; as, the
   lactiferous vessels, cells, or tissue of various vascular
   plants.
   [1913 Webster] Lactific