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.
Infection: The invasion and multiplication of microorganisms such as bacteria, viruses, an... Inflammatory bowel disease: A group of chronic intestinal diseases characterized by infla... Intestine: The long, tubelike organ in the abdomen that completes the process of digestion... Intractable: Unstoppable.