graben /gräˈbən/ (geology)

A rift valley (qv under rift¹)

• primeurs
• primeval
• primeval atom
• primevally
• prime vertical
• primigenial
• primigravida
• primigravidae
• primigravidas
• primine
• primines
• priming
• priming-iron
• priming-irons
• priming-powder
• primings
• priming-wire
• primipara
• primiparae
• primiparas
• primiparities
• primiparity
• primiparous
• primitiae
• primitial