Pyridinium Tribromide is used as a brominating agent for organic synthesis especially for pharmaceuticals and hormones. It can be replaced for n-Bromosuccinimide. (N-Bromo derivatives and ammonium tribromides are mainly used as brominating agents)
Top definition. Vlad. Vlad is usually a Russian name, sometimes romanian, and usually is an athletic all around great guy that is good at everything. He is known to have a big penis and is a legend in bed. He has an amazing body and really funny. He is very popular especially with females...fine females.
Count Dracula was from Transylvania. The name comes from Vlad the Impaler, prince of Wallachia (now part of Romania). Vlad is something of a national hero in Romania for preventing the expansion of the Ottoman Empire but he was (and is) notorious for the cruelty of the punishments he meted out -- his favorite method being impalement.