another name for proustite, pyrargyrite
noun, Mineralogy. 1. a deep red, transparent variety of spinel, used as a gem. noun 1. a red transparent variety of spinel, used as a gemstone
- Ruby-tail wasp
noun 1. any of various brightly coloured wasps of the family Chrysididae, having a metallic sheen, which parasitize bees and other solitary wasps
- Ruby-throated hummingbird
[roo-bee-throh-tid] /ˈru biˌθroʊ tɪd/ noun 1. a small hummingbird, Archilochus colubris, the only hummingbird of eastern North America, having metallic-green upper plumage and a bright red throat in the male.
abbreviation 1. (the former) Royal Ulster Constabulary, now superseded by the Police Service of Northern Ireland RUC rapid update cycle