The primary substance in solution in crude oil, and remaining after distillation.

Any chemical species, ionic or molecular, capable of accepting or receiving a proton (hydrogen ion) from another substance; the other substance acts as an acid in giving of the proton. Also known as Brönsted base.

See <<root>>

1. The region that lies between an emitter and a collector of a transistor and into which minority carriers are injected.

2. The part of an electron tube that has the pins, leads, or other terminals to which external connections are made either directly or through a socket.

3. The plastic, ceramic, or other insulating board that supports a printed wiring pattern.

Foundation or part upon which an object or instrument rests.

See <<nitrogenous base>>

A transparent plastic film on which a photographic emulsion is applied.

See <<pavilion>>

1. A side or face upon which the altitude of a geometric configuration is thought of as being constructed.

2. For a logarithm, the number of which the logarithm is the exponent.

3. For a number system, the number whose powers determine place value.

4. For a topological space, a collection of sets, unions of which form all the open sets of the space.

Station or installation from which military forces operate and from which supplies are obtained.