?-Dave_Mysterious-?29 Sep 2003

halon n. chem. any of various gaseous compounds of carbon, bromine and other halogens, used to extinguish fires.

What?

a)Halons are compounds (molecules), fission is a nuclear process.
b)The elements in these molecules have lower atomic numbers than iron, so they wouldn't spontaneously fission anyway (their nuclei have a lower mass than their component nucleons)

I did just find out that "lyrate" is a word meaning "lyre shaped" though, which is pretty excellent.