synangium

from The Collaborative International Dictionary of English v.0.48

Synangium \Syn*an"gi*um\, n.; pl. {Synangia}. [NL., fr. Gr. ? +
   ? a hollow vessel.] (Anat.)
   The divided part beyond the pylangium in the aortic trunk of
   the amphibian heart. -- {Syn*an"gi*al}, a.
   [1913 Webster]