One of the mysteries of the English language finally explained.
More fully "occipitofrontalis muscle". A large flat muscle of the scalp, consisting of an occipital portion (arising from the occipital and temporal bones) and a frontal portion that are separated by the epicranial aponeurosis, and serving to draw the scalp backwards, raising the eyebrows.
Early 18th century. From post-classical Latin occipito-frontalis from occipito- + frontalis.
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