the purest and most concentrated essence of something | an artifact that is one of the individual parts of which a composite entity is made up; especially a part that can be separated from or attached to a system |
the most typical example or representative of a type | an abstract part of something |
the fifth and highest element after air and earth and fire and water; was believed to be the substance composing all heavenly bodies | the most favorable environment for a plant or animal |
| a straight line that generates a cylinder or cone |
| the situation in which you are happiest and most effective |
| any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter |
| one of four substances thought in ancient and medieval cosmology to constitute the physical universe |