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From The Collaborative International Dictionary of English v.0.48:
Flicker \Flick"er\, n. 1. The act of wavering or of fluttering; fluctuation; sudden and brief increase of brightness; as, the last flicker of the dying flame. [1913 Webster] 2. (Zool.) The golden-winged woodpecker (Colaptes aurutus); -- so called from its spring note. Called also yellow-hammer, high-holder, pigeon woodpecker, and yucca. [1913 Webster] The cackle of the flicker among the oaks. --Thoureau. [1913 Webster]