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| a semilunar valve between the pulmonary artery and the right ventricle of the heart that prevents the blood from flowing back into the right ventricle |
| a cord connecting the embryo or fetus with the placenta of the mother and transporting nourishment from the mother and wastes from the fetus |
extrinsic ex·trin·sic (ĭk-strĭn'sĭk, -zĭk)
adj.
Of or relating to an organ or a structure, especially a muscle, originating outside of the part where it is found or upon which it acts; adventitious.