loggerheadnoun [ C ]
/ˈlɒɡ.ə.hed//ˈlɑː.ɡɚ.hed/also loggerhead turtle, /ˌlɒɡ.ə.hed ˈtɜː.təl//ˌlɑː.ɡɚ.hed ˈtɝː.t̬əl/a type of turtle (= an animal living in or near water with a thick shell covering its body) that has a very large head:
Loggerhead turtles are named for their large heads that support powerful jaw muscles, allowing them to crush hard-shelled prey like clams.