Aether
aet·her
noun
1.
2.
a medium that was once supposed to fill all space and to support the propagation of electromagnetic waves
Origin
From Ancient Greek αἰθήρ (aithḗr, “upper air”). Doublet of Ether.
Related words
Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.