Another fun @internetarchive find. Here is a 1978 guide for Japanese speakers who need some English phrases for use in conferences, speeches, etc. https://archive.org/details/scienceenglish2/mode/2up
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Pg. 3:
友人諸君 - Dear Confreres
It *is* a word (I had to look it up), but something tells me it's never been in common circulation, even in academia.
@derioredio it is a rare one!