petro-

CIDE DICTIONARY

petro-,

A combining form from Gr. pe`tra a rock, pe`tros a stone; as, petrology, petroglyphic. [1913 Webster]

petro-, comb. form 1 rock.
2 petroleum (petrochemistry).

Etymology

Gk petros stone or petra rock

For further exploring for "petro-" in Webster Dictionary Online

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