A fictional metal, most commonly made from cobalt, Chromium, Uranium, and Titanium. It is the play on words of replacing the T and I off of Titanium, and putting C and Y as the substitute. It's common acumens is the channel on YouTube who named himself after the fictional metal. It is super tough, and lightweight making this *fictional* metal great for defending against bullets.

(Note) this metal isn't real, don't try it, and subscribe to Cytanium for letting me define his name, and letting me talk to him.
LOL, you were soo Cytanium out there.
by OBDictionaries April 14, 2021
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