nuchal line

nuchal line

noun

Definition of NUCHAL LINE

: any of several ridges on the outside of the skull: as a : one on each side that extends laterally in a curve from the external occipital protuberance to the mastoid process of the temporal bone—called also superior nuchal line b : occipital crest a c : one on each side that extends laterally from the middle of the external occipital crest below and roughly parallel to the superior nuchal line—called also inferior nuchal line