However, such logic is not always consistent with the development
of language.
I, myself, had figured it ought to be 'quadrigram' until someone
mentioned 'tetragram'.
In my dictionary, as illogical as it may seem, 'tetragram' is listed (but
not 'quadrigram'). And, of course, pentagram (not quinquegram
or quintegram, so far as I know) is used.
Go figure.
Karen
kstanley@charlotte.infi.net
karen_stanley@cpcc.cc.nc.us