-jēəm noun
( plural synan·gia -j(ē)ə)
Etymology: New Latin, from syn- + -angium
1. : the peripheral part of an arterial trunk from which the branches arise in a lower vertebrate — compare pylangium
2. : a sorus (as in ferns of the family Marattiaceae) made up of sporangia variously united or cohered into a compound structure