We found one dictionary that defines the word paleocanyon:

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1. paleocanyon: Wiktionary

Definitions from Wiktionary (paleocanyon) ▸ noun:  An ancient canyon. ▸ Words similar to paleocanyon ▸ Usage examples for paleocanyon ▸ Idioms related to paleocanyon ▸ Wikipedia articles (New!) ▸ Popular adjectives describing paleocanyon ▸ Words that often appear near paleocanyon ▸ Rhymes of paleocanyon ▸ Invented words related to paleocanyon