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The Collaborative International Dictionary
Pylangium

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.

Wiktionary
pylangium

n. (context anatomy English) The first and undivided part of the aortic trunk in the amphibian heart.