1. Very suddenly and to a great degree
   "conditions that precipitously increase the birthrate"
   - sharply 
2. Abruptly; in a precipitous manner
   "the mountains rose precipitously from the shore"

See also: precipitous

• periodontia
• periodontic
• periodontics
• periodontist
• periodontitis
• perioperative
• Periophthalmus
• periosteum
• peripatetic
• peripateticism
• Peripatidae
• Peripatopsidae
• Peripatopsis
• peripatus
• peripeteia
• peripetia
• peripety
• peripheral
• peripheral device
• peripheral nervous system
• peripheral vision
• peripherally
• periphery
• periphrasis
• periphrastic