Welkin
WordNet
noun
(1) The apparent surface of the imaginary sphere on which celestial bodies appear to be projected
WiktionaryText
Noun
- The sky, the upper air; the heavens.
- c1388, Geoffrey Chaucer, The Canterbury Tales,
- This day in mirth and revel to dispend
- Till on the welkin shone the starres bright
- c1388, Geoffrey Chaucer, The Canterbury Tales,
- firmament