内うち窓まど

noun

inner window; secondary window

Refers to an additional window installed on the interior side of an existing window, often for thermal insulation, soundproofing, or condensation prevention. Contrasts with 外窓 (そとまど, outer window).

See also: 外窓

• 冬ふゆの寒さむさ対たい策さくに内うち窓まどを設せっ置ちした。

  I installed an inner window as a measure against the winter cold.

• 内うち窓まどを閉しめると外そとの騒そう音おんがかなり減へる。

  Closing the inner window reduces outside noise considerably.