tubulus

from The Century Dictionary.

• noun Same as tubulure.
• noun In anatomy and zoology, a tubule: chiefly in the plural: as, tubuli lactiferi, the milk-ducts; tubuli uriniferi, the urinary tubules.
• noun In entomology, a prolongation of the abdomen, consisting of several rings which can be retracted one into another like a pocket-telescope, serving as an ovipositor. It is found in the females of many flies and of the hymenopterous family Chrysididæ. See Tubulifera, 1.
• noun In botany, in Hymenomycetes, a tube on the surface of the pileus which is lined with the hymenium; in Pyrenomycetes, same as neck (see pore, 3); in Diatomaceæ, same as cornu, 2 .