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

• genus Calla
• genus Calliandra
• genus Callicebus
• genus Callimorpha
• loment
• Lomogramma
• Lomotil
• lomustine
• Lomé
• Lonas
• Lonas annua
• Lonas inodora
• Lonchocarpus
• London
• London plane
• Londoner
• lone
• lone hand
• lone wolf
• Lone-Star State
• loneliness
• lonely
• loneness
• loner
• lonesome