1. (of metal or glass) not annealed and consequently easily cracked or fractured
   - brittle

See also: unhardened, untempered

• genus Paspalum
• genus Passer
• genus Passerina
• genus Passiflora
• genus Pastinaca
• genus Patella
• genus Pavo
• genus Pavonia
• genus Payena
• genus Pecari
• genus Pecopteris
• genus Pecten
• genus Pediculus
• genus Pedilanthus
• genus Pediocactus
• genus Pedioecetes
• genus Pedionomus
• genus Peireskia
• genus Pelargonium
• genus Pelecanus
• genus Pellaea
• genus Pellicularia
• genus Peltandra
• genus Peltiphyllum
• genus Penelope