RETROGRESSION n. 2 definitions
ower state of organization or structure, as when an animal, approaching maturity, becomes less highly organized than would be expected from its earlier stages or known relationship. Called also retrograde development, and regressive metamorphism.
RHINOSCLEROMA n.
A rare disease of the skin, characterized by the development of very hard, more or less flattened, prominences, appearing first upon the nose and subsequently upon the neighboring parts, esp. the lips, palate, and throat. J. V. Shoemaker.
RUN v. 71 definitions
extinct; as, an estate managed without economy will soon run out. And had her stock been less, no doubt She must have long ago run out. Dryden. -- To run over. (a) To overflow; as, a cup runs over, or the liquor runs over. (b) To go over, examine, or rehearse cursorily. (c) To ride or drive over; as, to run over a chi…