(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

(anatomy) The hymen

(anatomy, medicine) Synonym of eardrum.

(palynology) Section of exine forming the base of an aperture

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

(cytology) A double lipid bilayer that surrounds the genetic material in eukaryotic cells

(anatomy) The thin membrane that separates the canal of the cochlea from the vestibular scala in the inner ear.