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