The Collaborative International Dictionary of English v.0.48:
Oogenesis \O`o*gen"e*sis\, n. [Gr. w,'o`n an egg + E. genesis.] (Physiol.) The development, or mode of origin, of the ova. [1913 Webster]WordNet (r) 3.0 (2006):
oogenesis n 1: development of ova