- Pt
- PT boat
- Ptah
- ptarmigan
- Pteretis
- Pteretis struthiopteris
- Pteridaceae
- Pteridium
- Pteridium aquilinum
- Pteridium esculentum
- pteridological
- pteridologist
- pteridology
- Pteridophyta
- pteridophyte
- pteridosperm
- Pteridospermae
- Pteridospermaphyta
- Pteridospermopsida
- Pteriidae
- pterion
- Pteris
- Pteris cretica
- Pteris multifida
- Pteris serrulata
- Pternohyla
- Pternohyla fodiens
- Pterocarpus
- Pterocarpus angolensis
- Pterocarpus indicus
- Pterocarpus macrocarpus
- Pterocarpus marsupium
- Pterocarpus santalinus
- Pterocarya
- Pterocarya fraxinifolia
- Pterocles
- Pterocles alchata
- Pterocles indicus
- Pteroclididae
- Pterocnemia
- Pterocnemia pennata
- pterodactyl
- Pterodactylidae
- Pterodactylus
- Pterois
- pteropogon
- Pteropogon humboltianum
- Pteropsida
- Pteropus
- Pteropus capestratus
- Pteropus hypomelanus
- pterosaur
- Pterosauria
- Pterospermum
- Pterospermum acerifolium
- Pterostylis
- pteroylglutamic acid
- pteroylmonoglutamic acid
- pterygium
- pterygoid muscle
- pterygoid plexus
- pterygoid process
- Ptilocercus
- Ptilocrinus
- Ptilonorhynchidae
- Ptilonorhynchus
- Ptilonorhynchus violaceus
- Ptloris
- Ptloris paradisea
- PTO
- Ptolemaic
- Ptolemaic dynasty
- Ptolemaic system
- Ptolemy
- Ptolemy I
- Ptolemy II
- ptomain
- ptomaine
- ptomaine poisoning
- ptosis
- PTSD
- ptyalin
- ptyalise
- ptyalism
- ptyalith
- ptyalize
- Ptyas
- Ptyas mucosus
- Ptychozoon
- Ptychozoon homalocephalum