electron tube

n : a system of electrodes arranged in an evacuated glass or

metal envelope [syn: {tube}, {vacuum tube}, {thermionic

vacuum tube}, {thermionic tube}, {thermionic valve}]

electron model

A {model} of {semiconductor} behaviour in which

{donors} contribute the {charge} of an {electron}, and

{acceptors} contribute a space for same, in effect

contributing a fictional positive charge of similiar

magnitude. Physicists use the {electron model}. Some

language theorists consider language and the {electron} to be

{model}s in themselves.

Contrast {hole model}.

(1995-10-06)