Wiktionary
ionospheres
n. (plural of ionosphere English)
Usage examples of "ionospheres".
They had the minimum installations which could draw on their planets' ionospheres for power, and they were not expected to handle anything bigger than a twenty-ton lifeboat.
Nowadays all developed planets had landing-grids—monstrous structures which drew upon ionospheres for power and lifted and drew down star-ships with remarkable gentleness and unlimited force.