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

• blastoff
• blastogenesis
• blastogenetic
• blastoma
• blastomere
• blastomeric
• Blastomyces
• blastomycete
• blastomycosis
• blastomycotic
• blastoporal
• blastopore
• blastoporic
• blastosphere
• blastospheric
• blastula
• blastular
• blasé
• blat
• blat out
• blatancy
• blatant
• blatantly
• blate
• blather