meiosis      
noun [ U ]  biology specialized uk/maɪˈəʊ.sɪs/ us/maɪˈoʊ.sɪs/
 减数分裂(发生在有性生殖生物中的细胞分裂过程,一个细胞分为四个配子,每个拥有不同的混合染色体,一半存于原细胞中)
the type of cell division that happens as part of reproduction (= the process of producing young animals or plants), in which one cell divides into four gametes (= reproductive cells), each with a different mixture of chromosomes and half the number contained in the original cell
 Compare: mitosis