the hard largely calcareous covering of a mollusc or a brachiopod | slang for sexual intercourse |
hard outer covering or case of certain organisms such as arthropods and turtles | a fastener with a tapered threaded shank and a slotted head |
ammunition consisting of a cylindrical metal casing containing an explosive charge and a projectile; fired from a large gun | a propeller with several angled blades that rotates to push against water or air |
a metal sheathing of uniform thickness (such as the shield attached to an artillery piece to protect the gunners) | a simple machine of the inclined-plane type consisting of a spirally threaded cylindrical rod that engages with a similarly threaded hole |
the housing or outer covering of something | someone who guards prisoners |
a very light narrow racing boat | |
a rigid covering that envelops an object | |
the exterior covering of a bird's egg | |
the hard usually fibrous outer layer of some fruits especially nuts | |
the material that forms the hard outer covering of many animals | |