petr-
petrel petrescence petrescent petri- petrifaction petrification petrify petrine petro- petrochemical petrochemistry petrodollar petrogenesis petrogenetic petroglyph petroglyphic petrograph petrographer petrographic petrographical petrographically petrography petroil petrol petrol bomb petrol-engine petrol station petrol tank petrolatum |
petr-
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