The ARK (also spelled Ark) is a barrel attachment found in the Extinction maps Awakening and Exodus. It allows weapons to turn into a laser weapon, though it still uses conventional ammunition and also has the additional effect of causing extra damage to cryptids, which further makes any that are killed with the weapon it's attached to explode in a similar fashion as to the Pipe Bombs.
A kidney, ureter, and bladder (KUB) study is an X-ray study that allows your doctor to assess the organs of your urinary and gastrointestinal systems. Doctors can use it to help them diagnose urinary disorders and causes of abdominal pain.
Also found in: Acronyms, Wikipedia. [kidneys, ureters, and bladder] a plain film of the abdomen, providing information about abdominal organs including the kidneys, ureters, and bladder. Abbreviation for kidneys, ureters, bladder; archaic term for a plain frontal supine radiograph of the abdomen, but still used. KUB. abbreviation for kidney, ureter, and bladder; a term used in a radiographic examination to determine the location, size, shape, and malformation of the kidneys, ureters, and bladder. Stones and calcified areas may be detected.