neither

pron. not this and not that

Either is an English pronoun, adjective, and conjunction, meaning one, or the other, of two. Its origin is from Old English ǽghweþer, which literally analyses as a compound word "any - whether."Either/or means "one, or the other, but not both". Its negative is neither/nor, meaning "none of them".
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Adverb
1. after a negative statement used to indicate that the next statement is similarly negative; "I was not happy and neither were they"; "just as you would not complain, neither should he"

(conj.)
not either; generally used to introduce the first of two or more coordinate clauses of which those that follow begin with nor.
  

(a.)
Not either; not the one or the other.
  

fe1 lyu2 fei ma3
Neither donkey nor horse.
Describing something unseemly. Neither fish nor fowl.