DOWN, _n._ Small soft feathers of plumulaceous structure, generally
growing about the roots of _plumæ_, and concealed by them. See PLUMULÆ.
DOWN´Y, _a._ Of plumulaceous structure. A part of the plumage is of
down-feathers, and the bases of the contour feathers usually also are of
_downy_ structure.
DUCT, _a._. Any tube for conveyance of an animal product; as _oviduct_,
sperm-_duct_, lachrymal _duct_.
DUOD´ENAL, _a._ Pertaining to the duodenum.
DUOD´ENUM, _n._ A short portion of the upper intestine next to the
gizzard, receiving the pancreatic and hepatic secretions.
DU´RA MA´TER, _n._ Outer membranous investment of the brain.
DUSK´Y, _a._ Of any undefined dark color.