Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. At the back of the frontal bone; behind the forehead: a postfrontal suture.
  • adj. Toward the rear of the frontal lobe.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Behind the frontal bone
  • adj. Behind a front
  • n. A bone located behind the frontal bone.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Situated behind the frontal bone or the frontal region of the skull; -- applied especially to a bone back of and below the frontal in many animals.

from The Century Dictionary and Cyclopedia

  • Situated behind the forehead: as, a post-frontal bone.
  • Posterior with respect to certain gyres of the frontal lobe of the cerebrum.
  • n. A bone of the skull of sundry vertebrates, situated at the back part of the brim of the orbit of the eye. It is not recognized as a distinct bone in animals above birds. See cut under Ichthyosauria.
  • n. Same as postfrontal shield.

Etymologies

post- +‎ frontal (Wiktionary)

Examples

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