noun, plural gy·ne·ci·a [ji-nee-see-uh, -shee-uh, gahy-, jahy-] /dʒɪˈni si ə, -ʃi ə, gaɪ-, dʒaɪ-/. gynoecium. noun plural -cia (-sɪə)a variant spelling (esp US) of gynoecium