Lancet window

A lancet window is a type of window that is shaped like a long and skinny pointed arch. It looks like the shape of a lance, which is a weapon that knights used to use a long time ago in battles.

Imagine drawing a tall, skinny triangle on a piece of paper, but instead of a flat top, the top point is very sharp like an arrowhead. That is what a lancet window looks like.

Lancet windows were often used in medieval architecture, like in castles or cathedrals, because they were a popular design style at that time. They were used to let light into buildings and to make the building look pretty.

So, in summary, a lancet window is a long and skinny window with a pointed top that was often used in medieval buildings.