adit
n.
"entrance," c.1600, from Latin aditus "approach, entrance, a going to or drawing near," from past participle stem of adire "to approach," from ad- "to" (see ad-) + ire "to go," from PIE root *ei- "to go" (see ion).
〔李〕[ad-=to 到；it=going 走 ⇒“a going to a place 走到某地”→] n. approach；entrance途径；入口