petrolithic
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petrolithic — pet·ro·lith·ic … English syllables
petrogenesis — n. origin or development of rocks. ♦ petrogenic, a. ♦ petroglyph, n. ancient rock carving. ♦ petrography, n. description and classification of rocks. ♦ petrolithic a. as hard as rock, applied to road surface. ♦ petrology, n.… … Dictionary of difficult words