top lighting

/T AA1 P L AY0 T IH0 NG/
noun
  1. 1

    The upper (and usually smaller) part (casement) of a window, often hinged a the top

  2. 2

    Any glazing above a main window, partition or door, transom window

  3. 3

    A skylight.

  4. 4

    Light from above; toplighting.