permafrost /pûrˈmə-frost/

Permanently frozen subsoil

• bioweapon
• bioweapons
• biparous
• bipartisan
• bipartisanship
• bipartite
• bipartition
• bipartitions
• biped
• bipedal
• bipedalism
• bipedalisms
• bipeds
• bipetalous
• biphasic
• biphenyl
• biphenyls
• bipinnaria
• bipinnarias
• bipinnate
• biplane
• biplanes
• BIPM
• bipod
• bipods