1. Relating to or having sclerosis; hardened
   - sclerotic

See also: sclerosis

• genus Procnias
• genus Proconsul
• genus Procyon
• genus Progne
• genus Prosopis
• genus Prosopium
• genus Protea
• genus Proteles
• genus Proterochampsa
• genus Proteus
• genus Protium
• genus Protoavis
• genus Protoceratops
• genus Protohippus
• genus Prumnopitys
• genus Prunella
• genus Prunus
• genus Psaltriparus
• genus Psenes
• genus Psephurus
• genus Psetta
• genus Psettichthys
• genus Pseudacris
• genus Pseudaletia
• genus Pseudechis