noun. The vault or expanse of the heavens; the sky.

noun. Foundation; support; basis.

noun. The sky or heavens; the vault of heaven, viewed as something solid and abiding; the region of the air.

noun. A piece of jewelry, as a star or the like, meant to be worn in a head-dress, such as the commode or tower of the seventeenth century.

noun. Fixed foundation; established basis.

noun. The region of the air; the sky or heavens.

noun. The orb of the fixed stars; the most rmote of the celestial spheres.

noun. The vault of the heavens; the sky.

noun. basis.

noun. The field or sphere of an interest or activity.

noun. In the geocentric Ptolemaic system, the eighth sphere, which carried the fixed stars.

noun. the apparent surface of the imaginary sphere on which celestial bodies appear to be projected

"The head of the good beast rises into the heavens, the mysterious waters which cover the world flow along her spine; the star-covered underside of her body, which we call the firmament, is visible to the inhabitants of earth, and her four legs are the four pillars standing at the four cardinal points of the world."

firmamental  

surface  

abyss  blackness  canopy  constellation  dome  

Caelus  air  azure  blue sky  caelum