- petro- (1)
[petro- 词源字典]
- before vowels petr-, word-forming element used from 19c., from comb. form of Greek petros "stone," petra "rock" (see petrous). [petro- etymology, petro- origin, 英语词源]
- petro- (2)
- word-forming element used from mid-20c. to mean "of or having to do with petroleum products," from petroleum.