windowsill

• window sill, window-sill

From window +‎ sill.

• (UK) IPA^(key): /ˈwɪndəʊˌsɪl/, /ˈwɪndəˌsɪl/
• (US) IPA^(key): /ˈwɪndoʊˌsɪl/

• Audio (US):

  (file)

windowsill (plural windowsills)

1. (architecture) The horizontal member protruding from the base of a window frame.
   • 1991, Bob Gordon, Orchid Seedling Care: With Special Emphasis on Water Quality:

     An upscale version of this tried and true method of providing windowsill humidity is the use of plastic 'egg crating' instead of gravel.

   • 2001, Christopher Fowler, The Devil in Me, page 12:

     You could tell summer was coming because people were drinking on the street, searching for spaces on the windowsills of the pub to balance their beerglasses.

   • 2015, Nathan Williams, The Kinfolk Home: Interiors for Slow Living, Artisan Books, →ISBN, page 277:

     north-facing rooms: These rooms receive the least light if you live up north, so choose plants that can endure low-light conditions and keep them directly on the windowsill. Some suggestions include pothos, philodendrons, arrowheads, Chinese evergreens, peace lilies and zamioculcas (or “ZZ”).

   • 2017, Irina Maltseva, Aleksandr Elokhov, Konstantin Tkachuk, Kseniia Maltceva, “Design without thermal bridges”, in 9th International Scientific Conference Building Defects:

     The most unreliable joints are in connections between the wall with ceilings and roofing, esconson of windows, places under the windowsills, exits to the balcony or veranda...