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

• herba impia
• herbaceous
• herbaceous plant
• herbage
• herbal
• herbal medicine
• herbal tea
• herbal therapy
• herbalism
• herbalist
• herbarium
• Herbart
• Herbert
• Herbert A. Simon
• Herbert Alexander Simon
• Herbert Blythe
• Herbert Clark Hoover
• Herbert George Wells
• Herbert Henry Asquith
• Herbert Hoover
• Herbert Kitchener
• Herbert Marcuse
• Herbert Marshall McLuhan
• Herbert Marx
• Herbert McLean Evans