From cycle +‎ -ist, 1882.^[1]

• (UK, US) IPA^(key): /ˈsaɪ.klɪst/, /ˈsaɪ.kəlɪst/

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cyclist (plural cyclists)

1. A person who rides a cycle, especially a bicycle, or who habitually engages in cycling.

   Synonyms: (rare) bicyclist, (dated) cycler, (obsolete) wheeler, (dated) wheelman, (dated) wheelwoman, (dated) cycleman, pedaller, biker

   Hyponyms: paracyclist, bicyclist, tricyclist, roadie, downhiller, weight weenie, Lycra lout, road warrior

   • 1903 December 26, A[rthur] Conan Doyle, “The Adventure of the Solitary Cyclist”, in The Return of Sherlock Holmes, New York, N.Y.: McClure, Phillips & Co., published February 1905, →OCLC:

     A solitary cyclist was coming towards us. His head was down and his shoulders rounded, as he put every ounce of energy that he possessed on to the pedals. He was flying like a racer.

2. (dated) A motorcyclist.
   • 1966 December 31, “45 Cyclists Fined And Told by Judge: Stay Out of Newark”, in The New York Times‎^[1], →ISSN:

     Most of the cyclists were members of the Pagans' Motorcycle Club of Washington.