Eustachian Valve

( Anat. ) A semi linear, membranous valve, which separates the right auricle of the heart from the inferior vena cava, first described by Eustachius. Eusta'chi us, or Eustachio, BARTOLOMEO, an eminent Italian physician of the 16th century. He settled at Rome, where he formed his anatomical tables, and made several important discoveries, among which is the Eustachian tube , q. v. Boerhaave published this author's Opuscula Anatomic a in 1707. D. 1570. Eustatius, or Eusta'tia, (St.,) one of the Dutch Leeward Caribbee Islands, in the W. Indies, 10 m. from St. Christopher's; area , 190 sq. m. It rises out of the ocean in the form of a huge, volcanic, pyramidal rock, tapering to its summit, and, in proportion to its size, is one of the finest and best cultivated islands of all the Caribbees. Pop . 3,000.