Dictionary

All Word
pressure level Noun the force applied to a unit area of surface
particle beam Noun a collimated flow of particles (atoms or electrons or molecules)
prevailing wind Noun the predominant wind direction
puff of air Noun a short light gust of air
programmed cell death Noun a type of cell death in which the cell uses specialized cellular machinery to kill itself
particulate radiation Noun a stream of atomic or subatomic particles that may be charged positively (e.g. alpha particles) or negatively (e.g. beta particles) or not at all (e.g. neutrons)
parhelic circle Noun a luminous halo parallel to the horizon at the altitude of the sun
parhelic ring Noun a luminous halo parallel to the horizon at the altitude of the sun
parhelion Noun a bright spot on the parhelic circle
proton magnetic resonance Noun resonance of protons to radiation in a magnetic field
pea-souper Noun a heavy thick yellow fog
phosphorescence Noun a fluorescence that persists after the bombarding radiation has ceased
photoelectricity Noun electricity generated by light or affected by light
piezoelectricity Noun electricity produced by mechanical pressure on certain crystals (notably quartz or Rochelle salt)
piezoelectric effect Noun electricity produced by mechanical pressure on certain crystals (notably quartz or Rochelle salt)
piezo effect Noun electricity produced by mechanical pressure on certain crystals (notably quartz or Rochelle salt)
pleochroism Noun the phenomenon of different colors appearing when certain crystals are viewed from different directions
paramagnetism Noun materials like aluminum or platinum become magnetized in a magnetic field but it disappears when the field is removed
pleomorphism Noun (biology) the appearance of two or more distinctly different forms in the life cycle of some organisms
pleomorphism Noun (chemistry) the existence of different kinds of crystal of the same chemical compound
polarization Noun the phenomenon in which waves of light or other radiation are restricted in direction of vibration
polarization Noun the condition of having or giving polarity
peat moss Noun any of various pale or ashy mosses of the genus Sphagnum whose decomposed remains form peat
plant kingdom Noun (botany) the taxonomic kingdom comprising all living or extinct plants
plant cell Noun a cell that is a structural and functional unit of a plant
plantlet Noun a young plant or a small plant
pileus Noun a fruiting structure resembling an umbrella or a cone that forms the top of a stalked fleshy fungus such as a mushroom
peridium Noun outer layer of the spore-bearing organ in many fungi
poudrin Noun small crystals of ice
podetium Noun an organ or body resembling a stalk
plant order Noun the order of plants
pot plant Noun a plant suitable for growing in a flowerpot (especially indoors)
pleurocarp Noun a moss having the archegonium or antheridium on a short side branch rather than the main stalk
pleurocarpous moss Noun a moss having the archegonium or antheridium on a short side branch rather than the main stalk
prevailing westerly Noun the winds from the west that occur in the temperate zones of the Earth
parallax Noun the apparent displacement of an object as seen from two different points that are not on a line with the object
pond pine Noun large three-needled pine of sandy swamps of southeastern United States
progymnosperm Noun an ancestral fossil type from which modern gymnosperms are thought to have derived
pecopteris Noun Carboniferous fossil fern characterized by a regular arrangement of the leaflets resembling a comb
pteridophyte Noun plants having vascular tissue and reproducing by spores
ponderosa Noun common and widely distributed tall timber pine of western North America having dark green needles in bunches of 2 to 5 and thick bark with dark brown plates when mature
ponderosa pine Noun common and widely distributed tall timber pine of western North America having dark green needles in bunches of 2 to 5 and thick bark with dark brown plates when mature
pine family Noun a family of Pinaceae
pine Noun a coniferous tree
pine Noun straight-grained durable and often resinous white to yellowish timber of any of numerous trees of the genus Pinus
pine Verb have a desire for something or someone who is not present
pine tree Noun a coniferous tree
pinon Noun any of several low-growing pines of western North America
pinyon Noun any of several low-growing pines of western North America
pycnidium Noun flask-shaped asexual structure containing conidia