1. Having three atoms; - said of certain elements or radicals 
2. Having a valence of three; trivalent; sometimes, in a specific sense, having three hydroxyl groups, whether acid or basic

Encyclopedia: Triatomic

• astragal
• bench warmer
• bench warrant
• bencher
• Benchley
• benchmark
• bend
• bend dexter
• bend over backwards
• bend sinister
• bendability
• bendable
• benday
• Benday process
• bended
• bender
• bending
• Bendopa
• bends
• bendy
• bendy bus
• bendy tree
• bene
• beneath
• Benedetto Caetani