1. The Archimedes screw, or screw pump, is a machine that can raise water from a lower to a higher level

2. Archegonium archeologist archeology archeozoic archeptolemus archesporia archesporial archesporium archetypally archilochian archimedean archimedes' screw archipelagic archipelago architectonic architectonics architectural arcifinious arcosolia arcosolium arcrgand diagram arcticologist arcticology arenicolous Arenosity areocentric areography

3. The father of simple machines, he introduced the concept of the lever and the compound pulley, as well as inventions ranging from water clocks to the famous Archimedes screw.