nor

Etymology 1

From Middle English nauther, from nother. Cognate with neither.

conj

1. (literary) And... not (introducing a negative statement, without necessarily following one).
   Nor did I stop to think, but ran.
   They are happy, nor need we worry.
   And, moreover, I had made my vow to preserve my rank unknown till the crusade should be accomplished; nor did I mention it […] 1825, Sir Walter Scott, The Talisman
   Water, water, every where, / Nor any drop to drink. 1797, Samuel Taylor Coleridge, The Rime of the Ancient Mariner
2. A function word introducing each except the first term of a series, indicating none of them is true.
   I am neither hungry nor thirsty nor tired.
   The ability to shift profits to low-tax countries by locating intellectual property in them[…]is often assumed to be the preserve of high-tech companies.[…]current tax rules make it easy for all sorts of firms to generate[…]“stateless income”: profit subject to tax in a jurisdiction that is neither the location of the factors of production that generate the income nor where the parent firm is domiciled. 2013-06-22, “T time”, in The Economist, volume 407, number 8841, page 68
3. Used to introduce a further negative statement.
   The struggle didn't end, nor was it diminished.
4. (UK, dialect) Than.
   He's no better nor you.
   'I used to think, when you first come into these parts, as you were no better nor you should be.' 1861, George Eliot, Silas Marner, London: Penguin Books, published 1967, page 131
   I wouldn’t like to live here though, not after dark. Sooner you nor me. 1967, Barbara Sleigh, Jessamy, Sevenoaks, Kent: Bloomsbury, published 1993, page 92

Etymology 2

From Etymology 1 (sense 2 above), reinterpreted as not + or or negation + or.

noun

1. (logic, electronics) Alternative form of NOR