The Collaborative International Dictionary of English v.0.48:
Bregma \Breg"ma\, n. [Gr. ? the front part of the head: cf. F. bregma.] (Anat.) The point of junction of the coronal and sagittal sutures of the skull. [1913 Webster]WordNet (r) 3.0 (2006):
bregma n 1: the craniometric point at the junction of the sagittal and coronal sutures at the top of the cranium