Reduction in the number of spermatozoa in the semen.
Late 19th century; earliest use found in Frank Foster (1841–1911). From oligo- + zoosperm + -ia.
英汉双解词典包含464360条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。