mandible

• 指脊椎动物下颌的骨头，即能活动的下颌骨；也指节肢动物的上颚或口器。

A noun referring to the jaw in vertebrates that is hinged to open the mouth.

1. B2formalmedical

   The lower jawbone in vertebrates, hinged to the skull, which allows the mouth to open and close.

   下颌骨

   • The patient suffered a fracture in his mandible after the fall.
   • The dentist examined the alignment of the upper and lower mandible.
   • Fossils of the mandible help scientists understand ancient species.

   同义词jawjawbonelower jawmandibula

2. Insect mouthpartB2formalscientific

   One of a pair of hard mouthparts in insects and some arthropods, used for biting, chewing, or holding food.

   昆虫口器

   • The beetle uses its strong mandibles to chew through wood.
   • Ants carry food with their mandibles back to the colony.
   • Dragonfly larvae have extendable mandibles to catch prey.

   同义词jaw