or win·dow sill
Examples from the Web for windowsill
That morning, he sat in the windowsill and began his day like every other: reading the Bible passage that coincided with the date.‘Argo’ in the Congo: The Ghosts of the Stanleyville Hostage Crisis|Nina Strochlic|November 23, 2014|DAILY BEAST
A rusty, iron key to the past sits on a windowsill in my home.
Just behind the frame, on the windowsill, is a brass logo for the now defunct William Morris Agency.
It appeared to be supporting itself by two clawlike hands upon the windowsill.The House on the Borderland|William Hope Hodgson
A spring gun bolt burned a groove in the windowsill next to his head and smashed into the blackboard across the room.Narakan Rifles, About Face!|Jan Smith
Hence he was trying his best to discover something familiar about the figure now clambering up over the windowsill.The Banner Boy Scouts on a Tour|George A. Warren
Perry leaned over the windowsill and bawled the command down into the darkness.The Adventure Club Afloat|Ralph Henry Barbour
One night I found her sitting in the moonlight with her face dropped forward on the windowsill.The Arena|Various