Source : Webster's Revised Unabridged Dictionary (1913)

Flicker \Flick"er\, n.
   1. The act of wavering or of fluttering; flucuation; sudden
      and brief increase of brightness; as, the last flicker of
      the dying flame.

   2. (Zo["o]l.) The golden-winged woodpecker ({Colaptes
      aurutus}); -- so called from its spring note. Called also
      {yellow-hammer}, {high-holder}, {pigeon woodpecker}, and
      {yucca}.

            The cackle of the flicker among the oaks.
                                                  --Thoureau.