Shell

Shell

1. Ammunition consisting of a cylindrical metal casing containing an explosive charge and fired from a large gun. The battleship began to shell the enemy on the shore.
2. The material that forms the hard outer covering of many animals. A turtle has a large hard shell to protect itself.
3. A usually sleeveless and collarless, typically knit blouse. She wore a simple blue shell to the dinner.

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Shown is a spiked shell of a sea creature