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There are 6 twelve-letter words beginning with PETROG

PETROGENESES	• petrogeneses n. Plural of petrogenesis. • PETROGENESIS n. formation or development of rocks.
PETROGENESIS	• petrogenesis n. The branch of petrology dealing with the origin of igneous rocks. • PETROGENESIS n. formation or development of rocks.
PETROGENETIC	• petrogenetic adj. (Geology) Of or pertaining to petrogenesis, the creation of new rock. • PETROGENETIC adj. relating to petrogenesis.
PETROGLYPHIC	• petroglyphic adj. Of or pertaining to petroglyphy. • PETROGLYPHIC adj. of or like a petroglyph, an ancient rock-carving.
PETROGRAPHER	• petrographer n. A person practicing petrography. • PETROGRAPHER n. a practitioner of petrography.
PETROGRAPHIC	• petrographic adj. Relating to petrographs. • petrographic adj. Relating to petrography. • PETROGRAPHIC adj. relating to petrography, also PETROGRAPHICAL.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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English Wiktionary: 7 words
Scrabble in French: 4 words
Scrabble in Spanish: 3 words
Scrabble in Italian: 3 words
Scrabble in German: no word
Scrabble in Romanian: 8 words

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