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

• amortizable
• amortization
• amortize
• Amos
• amount
• amount of money
• amour
• amour propre
• amoxicillin
• Amoxil
• Amoy
• amp
• amperage
• ampere
• ampere-hour
• ampere-minute
• ampere-second
• ampere-turn
• ampersand
• amphetamine
• amphetamine sulfate
• amphetamine sulphate
• amphibia
• amphibian
• amphibian family