Source : Webster's Revised Unabridged Dictionary (1913)

Rubythroat \Ru"by*throat`\, n. (Zo["o]l.)
   Any one of numerous species of humming birds belonging to
   {Trochilus}, {Calypte}, {Stellula}, and allies, in which the
   male has on the throat a brilliant patch of red feathers
   having metallic reflections; esp., the common humming bird of
   the Eastern United States ({Trochilus colubris}).