Clues for the word "CRYOGEN"

We've had 4 crossword clues used for this word, and seen it 4 times in crosswords. It was last seen in Pat Sajack's Code Letter crossword on July 20, 2010.

Referring Clues

Refrigerant
Liquid used as a refrigerant
Call for melon in the freezer
Keen to get type of melon in freezer

Last Seen In

Pat Sajack's Code Letter - July 20, 2010
Universal - October 08, 2007
USA Today - October 08, 2007
Guardian Cryptic - August 21, 2000