dyad /dīˈad/

1. A pair of units treated as one
2. A bivalent atom, radical, or element (chem)

dyadˈic adjective

• underlaying
• underlays
• underlease
• underleased
• underleases
• underleasing
• underlet
• underlets
• underletter
• underletters
• underletting
• underlettings
• underleveraged
• underlie
• underlies
• underline
• underlined
• underlinen
• underlinens
• underlines
• underling
• underlings
• underlining
• underlip
• underlips