shell
nounUK /ʃel/
US /ʃel/
The hard outside cover of an egg, nut, or sea animal.
She found a pretty shell on the beach.
SYNONYMS
OTHER MEANINGS
2. A hard protective case that keeps something safe inside.
The turtle pulled its head back into its shell.
3. A program that lets you type commands to a computer.
He opened the shell to run the command.
4. A bomb or bullet that is fired from a large gun.
The old cannon shell was found in the field.