Ether - Definition
ether
n 1: the fifth and highest element after air and earth and fire
and water; was believed to be the substance composing all
heavenly bodies [syn: quintessence, ether]
2: any of a class of organic compounds that have two hydrocarbon
groups linked by an oxygen atom
3: a medium that was once supposed to fill all space and to
support the propagation of electromagnetic waves [syn:
ether, aether]
4: a colorless volatile highly inflammable liquid formerly used
as an inhalation anesthetic [syn: ether, ethoxyethane,
divinyl ether, vinyl ether, diethyl ether, ethyl
ether]