WordReference Random House Unabridged Dictionary of American English © 2026
neu•tro•sphere
(no̅o̅′trə sfēr′, nyo̅o̅′-),USA pronunciation n.
- Astronomythe part of the atmosphere whose constituents are, for the most part, electrically neutral, extending from the earth's surface to the base of the ionosphere.
- neutro- + sphere
'neutrosphere' also found in these entries (note: many are not synonyms or translations):