Dear etaoin: unless the kids have access to some kind of collection of words likely to be used,
I think it is not the sort of word I would regard as reasonable. I am 85, had to take many
science courses to get into medical school, and read a dozen medical journals every week
but never heard of "gnotobiotic" before. It is obviously a sort of buzz word familiar only to a rather
restricted group of researchers. There must be thousands of words that would have been
more appropriate.