zona-tendinosahttp://www.oed.com/dictionary/zona-tendinosa_n%3Ftab%3Dmeaning_and_usezona tendinosa, n.
First published 1921; not fully revised

zona tendinosanoun

  1. 1842–
    1. 1842
      Zona Tendinosa, the whitish circle around the auriculo-ventricular orifice of the right side of the heart.
      R. Dunglison, Medical Lexicon (ed. 3)

Originally published as part of the entry for zona, n.

zona, n. was first published in 1921; not fully revised.