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.
Barium swallow or enema. Barium swallow, or esophagram, is an X-ray test that allows our doctors to examine the throat and esophagus. For the test, patients drink a solution containing barium, a chalky, white metallic powder. The solution travels down the digestive tract. A series of X-rays are then taken.