light hour - the distance light travels in a vacuum in one hour; approximately one billion kilometers. 1  astronomy unit - a linear unit used for astronomical distances. 2  light year, light-year - the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers.
keystone. n. 1. (Building) Also called: headstone or quoin the central stone at the top of an arch or the top stone of a dome or vault.2. something that is necessary to connect or support a number of other related things.(ËkiËstoÊn). n.eystone. n. 1. (Building) Also called: headstone or quoin the central stone at the top of an arch or the top stone of a dome or vault.
Keystone beer is a product of the Molson Coors Brewing Company in Golden, Colorado. It was first introduced in Chico, California in September 1989. Keystone can be found in canned, kegged, and occasionally, bottled form. Keystone Dry, introduced 1991, found with a black can, red label. 2  Keystone Ice, introduced 1994, ice brewed ale, found with a black label. 3  Keystone Amber Light, introduced 1994, found with a gold can with a diamond Amber Light badge. 4  Keystone V9, Puerto Rico only.