petroleum
n.
early 15c. "petroleum, rock oil" (mid-14c. in Anglo-French), from Medieval Latin petroleum, from Latin petra "rock" (see petrous) + oleum "oil" (see oil, n.).
〔李〕n.石油 [ole=oil] ←petr（o）-[GK] =rock岩石；petroleum石油
〔蒋〕[petr石，ol(e)没，-um名词后缀] 石油