'ayin (Hebrew #369)
a non-entity; generally used as a negative particle
KJV usage: else, except, fail, (father-)less, be gone, in(-curable), neither, never, no (where), none, nor, (any, thing), not, nothing, to nought, past, un(-searchable), well-nigh, without. Compare 370.
Pronounce: ah'-yin
Origin: as if from a primitive root meaning to be nothing or not exist