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.
Institution for treatment, care, and cure of the sick and wounded, for the study of disease, and for the training of physicians, nurses, and allied health care personnel. hospital. an institution for the care and treatment of sick and injured animals.