bivalent /bī-vāˈlənt or bivˈə-lənt/

1. Having a valency of two (chem)
2. Relating to one of a pair of homologous chromosomes (also noun)

• thumbstalls
• thumbs up
• thumbs-up
• thumbtack
• thumbtacks
• thumby
• Thummim
• thump
• thumped
• thumper
• thumpers
• thumping
• thumpingly
• thumps
• thunbergia
• thunbergias
• thunder
• thunder-and-lightning
• thunder-bearer
• thunder-bearers
• thunderbird
• thunderbirds
• thunderbolt
• thunderbolts
• thunderbox