Script Description File. a file describing certain kinds of complex script behaviour, used to control a rendering engine to which it has given its name. Created by Tim Erickson and used in Shoebox, LinguaLinks, and ScriptPad.
Superficial Digital Flexor Tendon. A tendon which runs down the back of the leg, splits below the fetlock, and attaches to the P I and P II. In the hind legs, the SDF acts primarily as a ligament of the stay apparatus.
SPILLWAY DESIGN FLOOD. The largest flood that a given project is designed to pass safely. The reservoir inflow discharge hydrograph used to estimate the spillway discharge capacity requirements and corresponding maximum storage elevation in the reservoir.