1. Incapable of being retracted or revoked
   - irrevocable

See also: sealed

• Phegopteris connectilis
• Phegopteris hexagonoptera
• Pheidias
• phellem
• Phellodendron
• Phellodendron amurense
• phenacetin
• phenacomys
• phenanthrene
• Phenaphen
• phenazopyridine
• phencyclidine
• phencyclidine hydrochloride
• phenelzine
• Phenergan
• Phenicia
• pheniramine
• pheno-safranine
• phenobarbital
• phenobarbitone
• phenocryst
• phenol
• phenolic
• phenolic plastic
• phenolic resin