When an engine is ignited, it produces thrust and boosts the rocket into the sky. After the propellant is used up, delay is activated, producing tracking smoke and allowing the rocket a brief coast.
infirmary (plural infirmaries) 1  A place where sick or injured people are cared for, especially a small hospital; sickhouse. 2  A clinic or dispensary within another institution.
Pleurisy, also known as pleuritus, is an inflammation of the pleura, or the lining of the lungs. This can often be very painful and can be debilitating to a point where a person cannot do much activity because of the pain.