Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.

Class VI. Words Relating to the Sentient and Moral Powers
Section III. Sympathetic Affections
1. Social Affections

890. Friend.

   NOUN:FRIEND, – of one’s bosom; alter ego [L.], other self; intimate, confidant (masc.), confidante (fem.), confident; best -, bosom -, fast- friend; amicus usque ad aras [L.], fidus Achates [L.]; persona grata [L.]; well-wisher; neighbor or neighbour, acquaintance.
  favorer, fautor [rare], patron, backer, Mæcenas; tutelary saint, good genius, advocate, partisan, sympathizer; ally; friend in need (auxiliary) [See Auxiliary].
  ASSOCIATE, consociate, compeer, comrade, mate, companion, camarade [F.], confrère [F.], colleague, comate, copemate or copesmate [obs.]; partner; side-partner, copartner, consort; old -, crony; chum [colloq.], pal [slang], buddy [slang, World War]; playfellow, playmate, schoolfellow; bedfellow, bunkie [colloq., U. S.], bedmate, chamberfellow; classfellow, classman, classmate; roommate, shopmate, shipmate, messmate; fellow -, boon -, pot- companion; fellow-man, stable companion; best man, brides-maid, maid of honor.
  [FAMOUS FRIENDSHIPS] Pylades and Orestes, Castor and Pollux, Achilles and Patroclus, Diomedes and Sthenalus, Hercules and Iolaus, Theseus and Pirithoüs, Epaminondas and Pelopidas, Nisus and Euryalus, Damon and Pythias, David and Jonathan, Christ and the beloved disciple; Soldiers Three, the Three Musketeers.
  par nobile fratrum [L., often ironical]; Arcades ambo [L.].
  HOST, hostess (fem.), Amphitryon, Boniface.
  GUEST, visitor, frequenter, habitué, protégé [F.].
  COMPATRIOT; fellow -, countryman; fellow townsman, townie [slang].
   INTERJECTION:“Thank God for a trusty chum!” [Kipling].    QUOTATIONS:
  1. Amici probantur rebus adversis.
  2. Ohne Bruder kann man leben nicht ohne Freund.
  3. Best friend, my well-spring in the wilderness.—G. Eliot
  4. Conocidos muchos amigos pocos.
  5. Friend more divine than all divinities.—G. Eliot
  6. Vida sin amigo muerte sin testigo.
  7. To each a man that knows his naked soul.—Kipling
  8. Friends who make salt sweet and blackness bright.—Masefield