triatomic /trī-ə-tomˈik/

1. Consisting of three atoms
2. Having three replaceable atoms or groups
3. Trivalent

• upthrew
• upthrow
• upthrowing
• upthrown
• upthrows
• upthrust
• upthrusting
• upthrusts
• upthunder
• upthundered
• upthundering
• upthunders
• uptick
• upticks
• uptie
• uptied
• upties
• uptight
• uptighter
• uptightest
• up-till
• uptilt
• uptilted
• uptilting
• uptilts