Definition of sub-etheric in English:
sub-etheric
(also sub-aetheric)
adjective ˌsʌbiːˈθɛrɪkˌsʌbɪˈθɛrɪk
Science Fiction Of, relating to, or involving a sub-ether (often with allusion to a supposed means of faster-than-light communication).
Origin
Early 20th century; earliest use found in Theosophist. From sub- + etheric, after sub-ether.