ectopterygoid

from The Century Dictionary.

• Pertaining to the external pterygoid bone or muscle.
• noun An external pterygoid bone; one of the lateral bones of the palate of some animals, as reptiles. It is highly developed, for instance, in the crocodile. See Crocodilia.
• noun In typical fishes, the external of two bones just behind the palatine, generally called pterygoid. See cut under palato-quadrate.
• noun In anatomy, the ectopterygoid muscle.

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

• noun zoology A certain ventral bone of reptiles.