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ground zero - the point of detonation (or above or below) of a nuclear weapon. point - the precise location of something; a spatially limited location; she walked to a point where she could survey the whole street.
Freebase(3.00 / 1 vote)Rate this definition: Sub-Zero. Sub-Zero is a video game character from the Mortal Kombat series and one of the original characters in the first Mortal Kombat game in 1992. A mainstay of the series, the character has appeared in every Mortal Kombat fighting game and also appears in many other Mortal Kombat media works such as the Mortal Kombat live action film series and animated series.