spo·ran·gi·um (sp?-r?n?j?-?m)n. pl. spo·ran·gi·a (-j?-?) A single-celled or many-celled structure in which spores are produced, especially in fungi, algae, mosses, and ferns. Also called spore case.[New Latin sporang?um : spor(o)- + Greek angeion, vessel; see angio-.]spo·ran?gi·al (-j?-?l) adj.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.sporangium (sp??rænd???m) n, pl -gia (-d???) (Biology) any organ, esp in fungi, in which asexual spores are produced[C19: from New Latin, from sporo- + Greek angeion receptacle] spo?rangial adjCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014spo?ran?gi?um (sp??ræn d?i ?m) n., pl. -gi?a (-d?i ?) the case or sac in which spores are produced. [1815?25;