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sky

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The sky is the upper atmosphere covering the earth.

The white light from the sun is filtered by the atmosphere to remove a larger portion of the blue wavelengths. As the blue light is scattered to a greater extent, your eyes respond to the light waves by registering larger amounts of blue light. This is why you see the sky as being blue.

(noun)

An example of the sky is where people see the sun, moon and stars.

Sky is defined as to hit, throw, shoot or hang up high in the air.

(verb)

An example of sky is to toss a ball above the trees.

See sky in Webster's New World College Dictionary

noun pl. skies

the upper atmosphere, esp. with reference to its appearance: blue skies, a cloudy sky
the expanse of the heavens that forms an apparent arch over the earth; firmament
1. heaven, or the celestial regions
2. climate or weather: the balmy southern sky

Origin: ME < ON, a cloud, akin to OE sceo, a cloud, OHG scuwo, shadow < IE base *(s)keu-, a cloud, OHG scuwo, shadow < IE base *(s)keu-, to cover, hide > hide, L cutis, skin, Gr skytos, leather

transitive verb skied or skyed, skying

to hit, throw, shoot, etc. high in the air
to hang (a picture) so high on a wall that it is not easily viewed

See sky in American Heritage Dictionary 4

noun pl. skies skies (skīz)

The expanse of air over any given point on the earth; the upper atmosphere as seen from the earth's surface.
The appearance of the upper atmosphere, especially with reference to weather. Often used in the plural: Threatening skies portend a storm.
The celestial regions; the heavens: stars in the southern sky.
The highest level or degree: reaching for the sky.