quid (n.1)

"bite-sized piece" (of tobacco, etc.), 1727, dialectal variant of Middle English cudde, from Old English cudu, cwidu (see cud).

quid (n.2)

"one pound sterling," 1680s, British slang, possibly from quid "that which is, essence," (c. 1600, see quiddity), as used in quid pro quo (q.v.), or directly from Latin quid "what, something, anything." Compare French quibus, noted in Barrêre's dictionary of French argot (1889) for "money, cash," said to be short for quibus fiunt omnia.

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Definitions of quid from WordNet

quid (n.)
the basic unit of money in Great Britain and Northern Ireland; equal to 100 pence;
Synonyms: British pound / pound / British pound sterling / pound sterling
quid (n.)
something for something; that which a party receives (or is promised) in return for something he does or gives or promises;
Synonyms: quid pro quo
quid (n.)
a wad of something chewable as tobacco;
Synonyms: chew / chaw / cud / plug / wad