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From The Collaborative International Dictionary of English v.0.48:
Jell-O \Jell"-O\, jello \jell"o\n. [a trademark.] a brand of sweetened fruit-flavored powdered mixture, packaged so that it can be conveniently dissolved in hot water and solidified into a gelatin, used as a dessert, sometimes with pieces of fruit mixed in; also the gelatin dessert thus prepared; sometimes used metaphorically; as, when he pulled a gun on me, my knees turned to Jell-O.. [Trademark] Note: Jell-O was originally a trademark and is still protected by trademark law, but is often used as one word, uncapitalized in informal writing. [WordNet 1.5 +PJC]