noun. In medicine, a flowing, running, or falling of humors or fluid matter from an upper to a lower part of the body; a discharge or flowing off of humors: as, a defluxion from the nose or head in catarrh: sometimes used as synonymous with inflammation, from the increased flow of blood (hyperemia) to an inflamed part.

noun. A discharge or flowing of humors or fluid matter, as from the nose in catarrh; -- sometimes used synonymously with inflammation.

noun. A flowing down; a running down.

noun. A discharge or flowing of fluid matter, as from the nose in catarrh.

"The horse “had a defluxion from the nose at the time of the bargain,” but McFarland “assured Newman it was no more than the ordinary distemper to which colts are subject.”"