LUNA n. 2 definitions
Silver. Luna cornea (Old Chem.), horn silver, or fused silver chloride, a tough, brown, translucent mass; -- so called from its resemblance to horn. Luna moth (Zoöl.), a very large and beautiful American moth (Actias luna). Its wings are delicate light green, with a stripe of purple along the front edge of the anterior…
SEMILUNAR a. 2 definitions
Shaped like a half moon. Semilunar bone (Anat.), a bone of the carpus; the lunar. See Lunar, n. -- Semilunar, or Sigmoid, valves (Anat.), the valves at the beginning of the aorta and of the pulmonary artery which prevent the blood from flowing back into the ventricle.