Top Definition
A fictional weapon of mass destruction used in the book "Cat's Cradle" by Kurt Vonnegut. This weapon can turn all of the earth's water into sloid form.
Ice Nine (n). can be the last weapon ever used
by i.m. October 23, 2006

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Ice that is nine times stronger than regular ice. Ice Nine's molecules are compact, and only a small amount of it is needed in order to turn regular water into solid Ice Nine. Consider to be a quite destructive weapon.
Ice Nine is so affective, it can freeze the ocean.
by Rainsdark January 29, 2003

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