the hard largely calcareous covering of a mollusc or a brachiopod | an original creation (i.e., an audio recording) from which copies can be made |
hard outer covering or case of certain organisms such as arthropods and turtles | key that secures entrance everywhere |
ammunition consisting of a cylindrical metal casing containing an explosive charge and a projectile; fired from a large gun | an artist of consummate skill |
a metal sheathing of uniform thickness (such as the shield attached to an artillery piece to protect the gunners) | a combatant who is able to defeat rivals |
the housing or outer covering of something | an authority qualified to teach apprentices |
a very light narrow racing boat | directs the work of others |
a rigid covering that envelops an object | a person who has general authority over others |
the exterior covering of a bird's egg | someone who holds a master's degree from academic institution |
the hard usually fibrous outer layer of some fruits especially nuts | presiding officer of a school |
the material that forms the hard outer covering of many animals | an officer who is licensed to command a merchant ship |