Opisthion

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Opisthion \O*pis"thi*on\, n. [NL., fr. Gr. ? hinder.] (Anat.)
     The middle of the posterior, or dorsal, margin of the great
     foramen of the skull.
     [1913 Webster] Opisthobranchia