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 | a protective cover that protects the face of a watch |
an abstract part of something | glassware made of quartz |
the most favorable environment for a plant or animal | a crystalline element used as a component in various electronic devices |
a straight line that generates a cylinder or cone | a rock formed by the solidification of a substance; has regularly repeating internal structure; external plane faces |
the situation in which you are happiest and most effective | a solid formed by the solidification of a chemical and having a highly regular atomic structure |
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 | colorless glass made of almost pure silica |
one of four substances thought in ancient and medieval cosmology to constitute the physical universe | |