1. Sloping downward toward each other to create a trough

Antonym: anticlinal

• prelection
• prelim
• preliminarily
• preliminary
• preliminary exam
• preliminary examination
• preliminary prospectus
• prelims
• preliterate
• Prelone
• prelude
• premarital
• premature
• premature baby
• premature ejaculation
• premature infant
• premature labor
• premature labour
• premature ventricular contraction
• prematurely
• prematureness
• prematurity
• premaxilla
• premaxillary
• premed