type of astronomical telescope lens used for photography, 1939, named for Estonian-born German optician Bernhard Voldemar Schmidt (1879-1935), who is said to have invented it.
updated on January 31, 2022
英语词源词典收录了45867条英语词源词条，基本涵盖了全部常用英语词汇的起源、历史，是研究英语词汇或通过词源学英语的必备工具。