Lewis Short
nĕc, an inseparable negative parti. cle in compounds for
* Nĕ: necopinans, necopinus; also in nĕgotium for nec-otium, and in neglego for nec-lego; and with suppressed c and lengthened ē: nēquaquam, nēquiquam.
Charlton T. Lewis, Charles Short, A Latin Dictionary