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)

precurˈsive or precurˈsory adjective

• book-hand
• book-hands
• book-holder
• book-holders
• bookie
• bookier
• bookies
• bookiest
• book in
• booking
• booking clerk
• booking clerks
• booking hall
• booking halls
• booking office
• booking offices
• bookings
• bookish
• bookishness
• bookishnesses
• bookkeeper
• bookkeepers
• bookkeeping
• bookkeepings
• bookland