American Heritage® Dictionary of the English Language, Fourth
Edition - n. An overhead window, as in a roof, admitting
daylight. - n. Light from the sky. Century Dictionary and
Cyclopedia - n. A window placed in the roof of a house, or in a
ceiling; a frame set with glass, whether horizontal or in one or
more inclined planes, and placed in a roof or ceiling, or in
some cases, as in photographers' studios, forming a considerable
part of the roof, for the purpose of lighting passages or rooms
below, or for affording special facilities for lighting, as for
artists' or photographers' needs. - n. The light of the sky;
specifically, the blue or pale white color of the aërial vault.
The light of the sky is, in general, reflected sunlight. Its
color is due to the size of the reflecting particles, blue light
coming from the finest gaseous particles and red light from
larger vaporous ones. Blue light may also come from the
molecules of the gases mixed together in the atmosphere. The
white light with which the blue is a