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We found one dictionary with English definitions that includes the word river boulders:
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General (1 matching dictionary)

1. river boulders: Vocabulary.com [home, info]

(Note: See river_boulder for more definitions.)

Quick definitions from WordNet (river boulder) ▸ noun:  a boulder that has been carried by a river to a place remote from its place of origin ▸ Also see river_boulder ▸ Words similar to river boulders ▸ Usage examples for river boulders ▸ Idioms related to river boulders (New!) ▸ Words that often appear near river boulders ▸ Rhymes of river boulders ▸ Invented words related to river boulders