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

• measuring stick
• measuring system
• measuring unit
• measuring worm
• meat
• meat and potatoes
• meat cleaver
• meat counter
• meat grinder
• meat hook
• meat hooks
• meat house
• meat market
• meat packer
• meat pie
• meat safe
• meat thermometer
• meat-eating
• meat-packing business
• meatball
• meathead
• meatiness
• meatless
• meatloaf
• meatman