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.

(idiomatic, colloquial, rhetorical question) Asked of somebody who was not present but was the topic of discussion.

glossodynia

present participle of burn the midnight oil

A medical condition, either inherited or caused by pressure on the nerves, that causes severe burning and aching of the feet, hyperesthesia, and vasomotor changes leading to excessive sweating.

(nuclear physics) A plasma undergoing nuclear fusion where the amount of fusion reactions is sufficient to produce enough energy to maintain the temperature of the plasma at a level necessary for further fusion processes.

A person snatched away from pressing danger.

plural of brand from the burning

plural of burning nuclear plasma

present participle of burn one's bridges