SKULL

[noun] [C] - the bony part of the head, which surrounds the brainThe soldiers discovered piles of human skulls and bones.He fractured his skull in a car accident.See picture: Skeleton(informal) How many times do I have to tell you something before it finally gets into your (thick) skull (= before you understand it).A skull and crossbones is a picture of a skull with two long bones crossing each other under it, which warns of death or danger.A skull and crossbones on a bottle usually means that it contains poison.Pirate ships used to fly the skull and crossbones (= a flag with this sign on it).