Answer: icenine

AnswerCrossword Clue
ICENINEFictional polymorph in Vonnegut's "Cat's Cradle"
ICENINECrystallizing substance in Vonnegut's "Cat's Cradle"
ICENINEHigh-melting-point substance in a Vonnegut novel
ICENINEOcean freezer in "Cat's Cradle"
ICENINESubstance causing a global catastrophe in "Cat's Cradle"