Definition of ruby-topaz hummingbird in US English:

ruby-topaz hummingbird

noun

  • (Also "ruby and topaz hummingbird") a hummingbird of northern South America and the Lesser Antilles, Chrysolampis mosquitus, the male of which has a bright red crown and nape and orange-yellow throat.

Origin

Mid 19th century. Compare German Rubintopas.