o·o·go·ni·um 
(ō′ə-gōnē-əm)
(ō′ə-gōnē-əm)n. pl. o·o·go·ni·a (-nē-ə) or o·o·go·ni·ums
1. Any of the cells that give rise through mitosis to the oocytes and are found in the ovaries of vertebrates.
2. A female reproductive structure in certain thallophytes and in oomycetes, usually a rounded cell or sac containing one or more oospheres.
[OO- + New Latin gonium, cell (from Greek gonos, seed; see GONO-).]
o′o·goni·al (-nē-əl) adj.