pectognathous
definition
having a beak or jaws that are narrow and flattened
example
The pectognathous morphology of the fish allows it to efficiently navigate through narrow crevices in coral reefs.
synonyms
beaked,narrow-jawed,flattened
word origin — From Greek 'pektos' meaning 'combed' or 'plaited' and 'gnathos' meaning 'jaw'