the purest and most concentrated essence of something | a bar of magnetic material (as soft iron) that passes through a coil and serves to increase the inductance of the coil |
the most typical example or representative of a type | the chamber of a nuclear reactor containing the fissile material where the reaction takes place |
the fifth and highest element after air and earth and fire and water; was believed to be the substance composing all heavenly bodies | (computer science) a tiny ferrite toroid formerly used in a random access memory to store one bit of data; now superseded by semiconductor memories |
| the choicest or most essential or most vital part of some idea or experience |
| the central meaning or theme of a speech or literary work |
| a small group of indispensable persons or things |
| the center of an object |
| the central part of the Earth |
| a cylindrical sample of soil or rock obtained with a hollow drill |