Non | Webster's Dictionary of the English Language

non
nōn (old collat. forms noenum and noenu, cf. Lachm. ad Lucr. tom. 2, p. 149 sq.: I noenum pro non ...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
non
nōn (1) adv.for old noenum, ne+oenum (unum), not, by no means, not at all : hocine agis an non?T.:...

An Elementary Latin Dictionary