The Inglenook
You are most likely to encounter the word today as part of the compound inglenook (literally "ingle" + "nook").
Historically, large open fireplaces were drafty. Builders created small corners with bench seats built directly into the chimney breast. These "nooks" were the warmest places in the house, reserved for the elderly or children.
The concept was revived during the Arts and Crafts movement by architects like Frank Lloyd Wright, who used inglenooks to create intimacy in large open floor plans.