ether

ether

noun \ˈē-thər\

Definition of ETHER

1

: a medium that in the wave theory of light permeates all space and transmits transverse waves

2

a : a light volatile flammable liquid C₄H₁₀O used especially formerly chiefly as an anesthetic—called also diethyl ether, ethyl ether, ethyl oxide b : any of various organic compounds characterized by an oxygen atom attached to two carbon atoms