Psilotales
— Navneord
– Engelsk
~ lower vascular plants having dichotomously branched sporophyte divided into aerial shoot and rhizome and lacking true roots
Psilotatae
— Navneord
– Engelsk
~ whisk ferns; comprising the family Psilotaceae or Psilotatae: vascular plants with no roots, partial if any leaf differentiation, and rudimentary spore sacs
Psilotum nudum
— Navneord
– Engelsk
~ pantropical epiphytic or terrestrial whisk fern with usually dull yellow branches and minute leaves; America; Japan; Australia
Psilotum
— Navneord
– Engelsk
~ type genus of the Psilotaceae
Psithyrus
— Navneord
– Engelsk
~ a large bee that resembles the bumblebee but lacks pollen-collecting apparatus and a worker caste
Psittacidae
— Navneord
– Engelsk
~ coextensive with the order Psittaciformes
Psittaciformes
— Navneord
– Engelsk
~ an order of birds including parrots and amazons and cockatoos and lorikeets and lories and macaws and parakeets
psittacosaur
— Navneord
– Engelsk
~ primitive dinosaur actually lacking horns and having only the beginning of a frill; long hind limbs and short forelimbs; may have been bipedal
psittacosaurus
— Navneord
– Engelsk
~ primitive dinosaur actually lacking horns and having only the beginning of a frill; long hind limbs and short forelimbs; may have been bipedal
psittacosis
— Navneord
– Engelsk
~ infectious disease of birds
psittacosis
— Navneord
– Engelsk
~ an atypical pneumonia caused by a rickettsia microorganism and transmitted to humans from infected birds
Psittacula
— Navneord
– Engelsk
~ a genus of Psittacidae