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.
characterized by or involving invasion; offensive: invasive war. 2. invading, or tending to invade; intrusive. 3. Medicine/Medical. requiring the entry of a needle, catheter, or other instrument into a part of the body, especially in a diagnostic procedure, as a biopsy.