The divided part beyond the pylangium in the aortic trunk of the amphibian heart.
A compound sporangium in which the sporangia are coherent, as in some Ferns.
[Greek] A compound sporangium in which the sporangia are coherent, as in some Ferns (bot.).
si-nan'ji-um, n. an arterial trunk: the boat-shaped sorus of certain ferns. [Gr. syn, with, angeion, a vessel.]