\Se"rous\, a. [Cf. F. s['e]reux. See {Serum}.] (Physiol.)
(a) Thin; watery; like serum; as the serous fluids.
(b) Of or pertaining to serum; as, the serous glands,
    membranes, layers. See {Serum}.
{Serous membrane}. (Anat.) See under {Membrane}.