A large convex lens or concave mirror that can concentrate the sun's rays onto a small area, heating up the area and thus resulting in ignition of the exposed surface.

A large convex lens or concave mirror that can concentrate the sun's rays onto a small area, heating up the area and thus resulting in ignition of the exposed surface.

To kill (someone) by tying them to a post and setting a fire beneath them

plural of sick burn

plural of burning question

(idiomatic) An important and pertinent question that urgently requires an answer.

Alternative spelling of slash and burn

Alternative form of powder burn

Alternative form of lean-burn.

Alternative form of heartburn