parethmoid

from The Century Dictionary.

• noun In ichthyology, the prefrontal; a bone in front of the frontal and beside the ethmoid in fishes.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Anat.) Near or beside the ethmoid bone or cartilage; -- applied especially to a pair of bones in the nasal region of some fishes, and to the ethmoturbinals in some higher animals.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective anatomy Near or beside the ethmoid bone or cartilage; applied especially to a pair of bones in the nasal region of some fishes, and to the ethmoturbinals in some higher animals.
• noun anatomy A parethmoid bone.