1. lacking a jaw or jaws; having no lower jaw
Usage: often used in zoology to describe certain fish species

Examples

• Lampreys are jawless fish that feed by attaching to other fish.
• The jawless creatures of the ancient seas eventually gave way to jawed fish.
• Scientists study jawless vertebrates to understand early fish evolution.
• A jawless mouth can still be effective for feeding, as lampreys demonstrate.
• The fossil record shows that jawless fish dominated the oceans millions of years ago.