precursor /prē-kûrˈsər/

1. Something that exists or goes in advance of another
2. An indication of the approach of an event
3. A forerunner, herald or harbinger
4. A predecessor
5. A substance from which the one in question is derived or manufactured (chem)

• besprinkling
• Bessarabian
• Bessemer
• Bessemer converter
• Bessemer iron
• Bessemer pig
• Bessemer process
• Besserwisser
• best
• bestad
• bestadde
• bestain
• bestained
• bestaining
• bestains
• bestar
• bestarred
• bestarring
• bestars
• best-ball
• best-before date
• best bet
• best bib and tucker
• best boy
• best boys