Standard Lemma guide
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
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noun
The upper part of the atmosphere, above about 60 miles or 100 km, in which there is great variation in its composition.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
History
From hetero- + -sphere.
Across languages
4 source translations are retained for this English entry.
