Emily Dickinson Lexicon

RHEUM, n. [Gr. ῥευμα, from ῥεω, to flow.]

1. An increased action of the vessels of any organ; but generally applied to the increased action of mucous glands, attended with increased discharge and an altered state of their excreted fluids.
2. A thin serous fluid, secreted by the mucous glands, &c.; as in catarrh. – Shak.