the nucleus of the ovum or sperm after fertilization but before they fuse to form the nucleus of the zygote
pronucleus详细解释
pro.nu.cle.us n.（名词）【复数】pro.nu.cle.i[-klô-o.] The haploid nucleus of a sperm or egg before fusion of the nuclei in fertilization.原核，前核：在受精细胞核结合之前，精子或卵子的单倍体细胞核 【引伸】 pronu.clear adj.（形容词）
