1. The apparent surface of the imaginary sphere on which celestial bodies appear to be projected
   - celestial sphere, sphere, empyrean, firmament, heavens, welkin

Type of: surface

• bikkie
• bikky
• bilabial
• bilabiate
• bilateral
• bilateral contract
• bilateral descent
• bilateral symmetry
• bilateralism
• bilaterality
• bilaterally
• bilaterally symmetric
• bilaterally symmetrical
• bilberry
• bilbo
• bilby
• bildungsroman
• bile
• bile acid
• bile duct
• bile salt
• bilestone
• bilge
• bilge keel
• bilge pump