Thesaurus.com
Dictionary.com
Definitions

skies

[skahyz] / skaɪz /
NOUN
earth's atmosphere
Synonyms
STRONG
azure empyrean firmament heavens lid vault welkin
WEAK
celestial sphere the blue upper atmosphere vault of heaven wild blue yonder
Antonyms
WEAK
earth

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.