stereochemistry (stÄr'Ä-Å-kÄm'Ä­-strÄ) The branch of chemistry that deals with the spatial arrangements of atoms in molecules and with the chemical and physical effects of these arrangements.
ECU. Short for Electronic Control Unit, the ECU is a name given to a device that controls one or more electrical systems in a vehicle. It operates much like the BIOS does in a computer.
Updated December 01, 2016. The ECU tendon, or extensor carpi ulnaris, is one of the major wrist tendons. It is on the ulnar side of the wrist, the same side as the small finger. The tendon starts on the back of the forearm, but at the level of the wrist joint it is directly on the side of the joint.