(anatomy) A thin membrane that lines the ligamentous surfaces of joint capsules, tendon sheaths where free movement is necessary, and bursae; it is composed of dense connective tissue and secretes synovial fluid.

(cytology) The semipermeable membrane that surrounds the cytoplasm of a cell.

(chemistry, physics) any of several processes for separating the components of mixtures by using thin barriers between two miscible fluids; any transmembrane force leads to preferential transport of one or more feed components

(physics, chemistry) a separation method in which a nonwetting, microporous membrane is used with a liquid feed phase on one side of the membrane and a condensing, permeate phase on the other

(biochemistry) A protein that is associated with a biological membrane; association typically refers to either the ability to copurify membrane lipids with said protein or the ability to visualize a physical association in situ.

plural of membrane protein

(anatomy) A layer of rod cells and cone cells in the retina of the human eye.

(anatomy) The mucous membrane that lines the nasal chambers; the pituitary membrane.

(humorous, slang, sometimes derogatory) insane; crazy

(anatomy, medicine) Synonym of eardrum.