from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A clip-fed, gas-operated assault rifle of Soviet design having a caliber of 7.62 millimeters and used throughout the world by armed forces and paramilitary organizations.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The Soviet-built 1947 Kalashnikov assault rifle or any similar rifle built to this design.
Russian A(vtomat) K(alashnikova), automatic gun of Kalashnikov, after Viktor Timofeevich Kalashnikov (born 1919), Soviet arms engineer.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Russian АК-47 (AK-47), shortened from автомат Калашникова 1947 (avtomát Kalášnikova 1947), from the name of the designer Mikhail Kalashnikov. (Wiktionary)