from
http://www.linguistics.berkeley.edu/~jblowe/REWWW/RE_fn.html
(unknown author)
"
The term 'allofamy', due to Matisoff (1978), refers to
relationship 'among the various individual members of the same word-
family'. English royal and regal, borrowed from French and Latin
respectively, are both ultimately traceable to the same PIE root *reg-,
and so are co-allofams in Modern English (Matisoff 1978:16-18, Matisoff
1992:160). A word family might contain both native words and words
borrowed from related languages; the borrowings may be recent or
ancient.
"
Is 'allofamy' a term cybalist should consider using for PIE (eg. are
the two roots PIE *gWen-/*gWax- (*gWen,-/*gWax-?) "come, go" and PGerm.
*gan,/*gax- "go" co-allofams)? It would of course in each case imply
the possibility of a loan.
Torsten