Main Entry: win·dow

Pronunciation: \ˈwin-(ˌ)dō, -də(-w)\

Function: noun

1 : fenestra 1
2 : a small surgically created opening : fenestra 2a
3 : a usually narrow interval of time or range of values for which a certain condition or an opportunity exists <coma and multiorgan failure can occur within hours and there may be a very narrow window of opportunity for transplantation—J. P. A. Lodge>—see therapeutic window