Synonyms of the word 
HYPETHRAL → HYPAETHRAL - UNENCLOSED
hypethral
- adj. Alternative form of hypaethral.
hypaethral
- adj. Open-air, outdoor, exposed to the sky.
unenclosed
- adj. Not enclosed.
If you are interested in words, visit the following sites :
- wiktionary.org/hypethral For complete definition of a word
- 1word.ws/hypethral to play with words, suffixs, prefixs, etc.