1. Not bearing a date
   - dateless

See also: undatable

• pfft
• PFLP
• PFLP-GC
• PG
• pH
• pH scale
• phacelia
• Phacelia campanularia
• Phacelia minor
• Phacelia tanacetifolia
• Phacelia whitlavia
• Phacochoerus
• phacoemulsification
• phaeochromocytoma
• Phaeophyceae
• Phaeophyta
• Phaethon
• Phaethontidae
• phaeton
• phage
• phagocyte
• phagocytic
• phagocytosis
• Phagun
• phaius