sky

/skaɪ/

/skaɪ/

Other forms: skies; skying

Want to see the sky? Go outside and look up! That’s assuming you’re not on Mars, of course. Everything you see above the surface of the Earth is the sky.

Astronomers use the term "celestial sphere" for the sky. It's the space that includes everything we can see from our earthbound perspective, including clouds, stars, the sun, and the moon. If your uncle takes you out for ice cream and says, "The sky's the limit!" he means that there is no limit at all—you can order anything, even an enormous banana split.

Definitions of sky

1. noun

   the atmosphere and outer space as viewed from the earth
   types:

   blue, blue air, blue sky, wild blue yonder

   the sky as viewed during daylight

   mackerel sky

   a sky filled with rows of cirrocumulus or small altocumulus clouds

   type of:

   atmosphere

   the envelope of gases surrounding any celestial body
2. verb

   throw or toss with a light motion
   synonyms: flip, pitch, toss

   types:

   submarine

   throw with an underhand motion

   lag

   throw or pitch at a mark, as with coins

   throw back, toss back

   throw back with a quick, light motion

   type of:

   fling

   throw with force or recklessness