We found one dictionary that defines the word palm stone:

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1. palm stone: Wiktionary

Definitions from Wiktionary (palm stone) ▸ noun:  Synonym of worry stone ▸ Words similar to palm stone ▸ Usage examples for palm stone ▸ Idioms related to palm stone ▸ Wikipedia articles (New!) ▸ Words that often appear near palm stone ▸ Rhymes of palm stone ▸ Invented words related to palm stone