groin
意味
- 鼠蹊(そけい)部
- 穹稜(きゅうりょう)(円形天井の相交わる稜線)
語源
英語の原文（Wiktionary）
From earlier grine, from Middle English grinde, grynde, from Old English grynde (“abyss”) (perhaps also "depression, hollow"), probably related to Proto-Germanic *grunduz; see ground. Later altered under the influence of loin.