The occipitofrontal diameter of the skull.
1Of or relating to the occipital and frontal bones of the skull, or the occipital and frontal lobes of the brain; specifically designating a diameter or circumference of the skull measured between the external occipital protuberance and the frontal bone (now usually the glabella).
2rare Designating the occipitofrontalis muscle.
Early 19th century (in an earlier sense). From occipito- + frontal, probably after French occipito-frontal, adjective and noun.