We found one dictionary that defines the word adboard:

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1. adboard: Wiktionary

Definitions from Wiktionary (adboard) ▸ noun:  a screen on which to present ads ▸ Words similar to adboard ▸ Usage examples for adboard ▸ Idioms related to adboard ▸ Wikipedia articles (New!) ▸ Popular adjectives describing adboard ▸ Words that often appear near adboard ▸ Rhymes of adboard ▸ Invented words related to adboard