sporangium
noun
spo·ran·gi·um spə-ˈran-jē-əm 
plural sporangia spə-ˈran-jē-ə
: a structure within which spores are produced
sporangial
spə-ˈran-j(ē-)əl
adjective 
Word History
Etymology
New Latin, from spor- + Greek angeion vessel — more at angio-
First Known Use
1821, in the meaning defined above
Medical Definition
sporangium
noun
spo·ran·gi·um spə-ˈran-jē-əm
plural sporangia -jē-ə
: a structure (as of an alga or fungus) within which spores are produced