a device for showing the operating condition of some system
a signal for attracting attention
(chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction
the act of exploding or bursting something; "the explosion of the firecrackers awoke the children"; "the burst of an atom bomb creates enormous radiation aloft"
a golf shot from a bunker that typically moves sand as well as the golf ball
a sudden outburst; "an explosion of laughter"; "an explosion of rage"
a violent release of energy caused by a chemical or nuclear reaction
the noise caused by an explosion; "the explosion was heard a mile away"
a sudden great increase; "the population explosion"; "the information explosion"