ether
n 1: (archaic) 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}]
2: a medium that was once supposed to fill all space and to
support the propagation of electromagnetic waves [syn: {aether}]
3: a colorless volatile highly inflammable liquid used as an
inhalation anesthetic [syn: {ethoxyethane}, {divinyl ether},
{vinyl ether}, {diethel ether}, {ethyl ether}]