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We found 8 dictionaries with English definitions that include the word volcanic rocks:
Click on the first link on a line below to go directly to a page where "volcanic rocks" is defined.

General (7 matching dictionaries)

1. volcanic rocks: Merriam-Webster.com [home, info]
2. volcanic rocks: Vocabulary.com [home, info]
3. volcanic rocks: Wordnik [home, info]
4. Volcanic rocks: Dictionary.com [home, info]
5. Volcanic rocks: Wikipedia, the Free Encyclopedia [home, info]
6. volcanic rocks: Free Dictionary [home, info]
7. Volcanic rocks: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

8. Volcanic rocks: Encyclopedia [home, info]

(Note: See volcanic_rock for more definitions.)

Quick definitions from WordNet (volcanic rock) ▸ noun:  extrusive igneous rock solidified near or on the surface of the Earth ▸ Also see volcanic_rock ▸ Words similar to volcanic rocks ▸ Usage examples for volcanic rocks ▸ Words that often appear near volcanic rocks ▸ Rhymes of volcanic rocks ▸ Invented words related to volcanic rocks