[pe-troh-jen-uh-sis] /ˌpɛ troʊˈdʒɛn ə sɪs/
the branch of petrology dealing with the origin and formation of rocks.
the origin and formation of rocks.
The branch of petrology that deals with the origin and formation of rocks, especially igneous rocks.
[pe-truh-glif] /ˈpɛ trəˌglɪf/ noun 1. a drawing or carving on rock, made by a member of a prehistoric people. /ˈpɛtrəˌɡlɪf/ noun 1. a drawing or carving on rock, esp a prehistoric one n. 1870, from French pétroglyphe, from Greek petra “rock” (see petrous) + glyphe “carving” (see glyph).
[pe-truh-grad; Russian pyi-truh-graht] /ˈpɛ trəˌgræd; Russian pyɪ trʌˈgrɑt/ noun 1. former name (1914–24) of (def 2). /ˈpɛtrəʊˌɡræd; Russian pɪtraˈɡrat/ noun 1. a former name (1914–24) of Saint Petersburg
[pe-truh-gram] /ˈpɛ trəˌgræm/ noun 1. a drawing or painting on rock, especially one made by a member of a prehistoric people.