pylangium

from The Collaborative International Dictionary of English v.0.48

Pylangium \Py*lan"gi*um\, n.; pl. {Pylangia}. [NL., from Gr. ?
   an entrance + ? a vessel.] (Anat.)
   The first and undivided part of the aortic trunk in the
   amphibian heart. -- {Py*lan"gi*al}, a.
   [1913 Webster]