hypognathous

adj.[动]下口式的

下颌短小的；指下颌短而向下伸出的；

形容词；

1、The hypognathous jaw is one of the distinguishing features of this particular species of fish.
这种特定物种的鱼的下颌短小是其区别之一。
2、The hypognathous structure of the insect allows it to feed on nectar from flowers with ease.
昆虫的下颌结构使其能轻松地吸食花蜜。