Definition of petro- in English:

petro-

Syllabification: petro-

combining form

1Of rock; relating to rocks: petrography

Origin

sense 1 from Greek petros 'stone', petra 'rock'; sense 2 from petroleum.

Definition of petro- in:

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Word of the day flagitious
Pronunciation: fləˈdʒɪʃəs
adjective
(of a person or their actions) criminal; villainous