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

• snowdrop windflower
• snowfall
• snowfield
• snowflake
• snowman
• snowmobile
• snowplough
• snowplow
• snowshoe
• snowshoe hare
• snowshoe rabbit
• snowstorm
• snowsuit
• snowy
• snowy egret
• snowy heron
• snowy orchid
• snowy owl
• snowy tree cricket
• SNP
• snub
• snub-nosed
• snuff
• snuff film
• snuff it