We found one dictionary that defines the word chimneyboard:

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1. chimneyboard: Wiktionary

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