mature ovum after penetration by sperm but before the formation of a zygote
ootid详细解释
o.o.tid n.（名词）A haploid cell that results from the meiotic division of an oocyte and becomes a female gamete or an ovum.卵（子）细胞：由于卵母细胞减数分裂产生而后形成配子或卵细胞的单倍体细胞 来源：oo-oo-(sperma)tid(sperma)tid
