Cistus, with its many hybrids and cultivars, is commonly encountered as a garden flower. The common name rockrose is applied to the species, a name also shared by the related genera Halimium, Helianthemum and Tuberaria, all in the family Cistaceae. The common name gum cistus is applied to resin-bearing species, especially C. ladanifer.
Quasars are part of a class of objects known as active galactic nuclei (AGN). Other classes include Seyfert galaxies and blazars. All three require supermassive black holes to power them.
cougar. 1  1 : a large powerful tawny-brown cat (Puma concolor synonym Felis concolor) formerly widespread in the Americas but now reduced in number or extinct in many areas âcalled also catamount, mountain lion, panther, puma. 2  2 slang : a middle-aged woman seeking a romantic relationship with a younger man.