selenium

A gray, non-metallic element, selenium is 34 on the periodic table of elements and has an

atomic weight of 78.96. Selenium usually is obtained as a by-product of lead, copper, and nickel refining, and is used in photoelectric cells, TV cameras, light meters, copy machines, and anti-dandruff shampoos, as well as to color glass red and to give black and white silver prints greater image stability. Although toxic to humans in excess, selenium is considered to be an essential mineral in small amounts. See also photophone.

• SDSL (Symmetric Digital Subscriber Line)
• SDTV (Standard Definition TeleVision)
• seamless
• search engine
• SECAM (Séquential Couleur Avec Mémoire)
• SECBR (Severely Errored Cell Block Ratio)
• second
• secondary domain
• Second Computer Inquiry
• secret-key encryption
• Section Overhead (SOH)
• section terminating equipment (STE)
• Secure European System for Applications in a Multivendor Environment (Sesame)
• Secure Hypertext Transport Protocol (S-HTTP)
• Secure Multipurpose Internet Mail Extension (S/MIME)
• Secure Sockets Layer (SSL)
• security
• security
• security
• security management
• seed rod
• segment
• segmentation
• segmentation and reassembly (SAR)
• seizure