"Forehead", besides the obvious meaning in anatomy, referring to the forward part of a lifeform's head, is used in slang as a derogatory term for Klingons, used by other races and cultures that lack the distinctive Klingon forehead ridges, such as the Cardassians. Usually used in plural form and capitalized, e.g., "The damned foreheads don't have enough brains to..." (ST novel: The Art of the Impossible)

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