vigour [ME] Vigour and vigorous [ME] are from Latin vigor, from vigere ‘be lively’, also found in invigorate [M17th].
英语词源词典收录了6069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。