petr
Greekrock, stone
Variants:petrpetro
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About This Root
From Greek petra (rock, stone). Petroleum is literally 'rock oil' (petra + oleum). Petrify means 'turn to stone' — both literally (fossil formation) and figuratively (frozen with fear). Petrology is the study of rocks. The proper name Peter also means 'rock,' as named in the New Testament.
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Associated Words · 6
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petroleum
A naturally occurring flammable liquid consisting mainly of hydrocarbons; crude oil
petrol
Refined petroleum fuel used in motor vehicles; gasoline
petroglyph
A prehistoric rock carving or drawing
petrify
To turn to stone; to paralyze with fear
petrifaction
The process of turning organic matter into stone; the state of being petrified
petrology
The scientific study of rocks and their origin, composition, and structure