ether اِتِر eter (#) Fr.: ether Physics: A hypothetical medium filling all space formerly postulated to
account for the propagation of → electromagnetic radiation
through space. In order to facilitate description and to provide a physical explanation of
various phenomena involving action at a distance and electromagnetism, a medium
had been postulated with mechanical properties adjusted to provide a consistent theory.
In 1887 Michelson and Morley attempted to measure the motion of the Earth
through the ether. No such motion was detected. The
→ Michelson-Morley experiment has been repeated under
different conditions, but the hypothesis of a stationary ether through which the
Earth moves is not verified.
The substance supposed by Aristotle to constitute stars and fill the outer space.
Chemistry:
A family of organic compounds with the general formula R-O-R’, where R and R’
are hydrocarbon radicals. In particular diethyl ether,
C2H5OC2H5, which is a volatile
colorless liquid with a pleasant smell.
See also: From L. æther “the upper air, pure air,” from Gk. aither “upper air,”
from aithein “to burn, shine.” |
