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ppm
Parts per million, the equivalent of 1 gram per tonne for example.
PRAM
PRAM: Random access memory with phase change (Phase-Change ...
Pre-combustion separation of CO2
The pre-combustion separation of CO2 is one of the ...
Pre-malignant
The term pre-malignant refers to a benign abnormality in a ...
Pre-neoplastic lesion
Pre-neoplastic lesions etymologically mean " before ...
PREBAT
The PREBAT (French National Research and Experimentation ...
Precambrian
The Precambrian supereon is the first phase in the Earth's ...
Precautionary principle
The precautionary principle reflects the "Lack of ...
Precession
Precession is a modification in the direction of the axis of ...
Precession constant
The precession constant is a coefficient of time in the ...
Precession-nutation
Precession-nutation is the displacement over time of the ...
Precious stone
Precious stone is a synonym of gem (q.v.).
Precordial pain
Precordial pain is a pain located in the precordial region, ...
Predisposition
A set of factors which increase the risk of a person ...
Pregnancy
Pregnancy is the process by which a new being develops in ...
Pregnancy test
A pregnancy test allows a woman to find out whether or not ...
Prehensile
Something that is prehensile has the potential to grasp.
Premammalian
Premammalian animals are vertebrates that came before ...
Pressure ulcer
A pressure ulcer is an area of skin and underlying tissue ...
Prestel
Prestel was the videotex system developed in Great Britain. ...
Prevalence
Epidemiology term meaning the number of people suffering ...
Prevention
Prevention is a group of measures taken to protect a given ...
Primaries (feathers)
Primaries are large feathers on the tips of wings, along the ...
Primary
A primary mineral is one that has not undergone the effects ...
Primary colour
A primary colour is one that cannot be obtained by mixing ...
Primary energy
Primary energy is the energy available in the environment ...
Primate
Primates are one of the 18 mammal orders, distinguished by: ...
Prime number
A whole number is said to be prime when its only divisors ...
Prime-boost
The prime-boost (primer-booster) is a vaccination strategy ...
Primitive filter
A primitive filter is a function that applies a simple ...
Primitive ocean
The primitive ocean was the first ocean formed on the Earth ...
Principle of action and reaction
Isaac Newton's third law published in the first volume of ...
Principle of complementarity
See "Copenhagen interpretation".
Principle quantum number
The principle quantum number n (or m) is an integer used in ...
Prion
The term "prion" was created by S. Prusiner to ...
Private key
The private key is the secret key in a pair of asymmetric ...
Probiotic
A probiotic is a food supplement containing living bacteria ...
Proboscis
From the Greek word proboscis: trunk. Elephants, which have ...
Procambium
Procambium is the primary meristem that forms the conductive ...
Procellariiformes
Procellariiformes is an order that includes seabirds, which ...
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Specific impulse
Protostome
Circuit routing
Sedna
Emulsion
Spin
Frequency
Cassette air conditioner
Open cluster
Ookinete
Luminol
Vector
Schrödinger's cat
Muscular dystrophy
Podcasting
Toughness
Kyoto Protocol
Brackish water
Promoter
Cryoturbation
XML
Counter-Strike
Kjokkenmodding
Polarisation
Jarosite
Dehydration
Superstring theory
Effusion
Active continental margin
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