We found one dictionary that defines the word hearthboard:

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1. hearthboard: Wiktionary

Definitions from Wiktionary (hearthboard) ▸ noun:  Synonym of fireboard ▸ Words similar to hearthboard ▸ Usage examples for hearthboard ▸ Idioms related to hearthboard ▸ Wikipedia articles (New!) ▸ Popular adjectives describing hearthboard ▸ Words that often appear near hearthboard ▸ Rhymes of hearthboard ▸ Invented words related to hearthboard