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.
A stye or hordeolum is a small, painful lump on the inside or outside of the eyelid. It is actually an abscess filled with pus and is usually caused by a staphylococcus bacteria eye infection.