Definition of ramus:
(n) :
(biology) A branching, as of nerves or blood vessels.
(n) :
(anatomy) A bony projection, particularly of the jaw, but also in the groin area, both subject to the maturing process of symphysis.
(n) :
(ornithology) The stem of a barb of a feather, from which the barbules extend.
(n) :
A small spray or twig.
(n) :
A surname.