| pannus |
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noun (plural panni)
- a hanging flap of skin or other tissue, especially one covering the cornea (in trachoma) or cartilage (in rheumatoid arthritis)
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| parhelic circle |
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noun
- A luminous halo, each side of the sun parallel to the horizon, caused by refraction of sunlight through ice crystals
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| pentad |
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noun
- a group or series of five things
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| photochemical smog |
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noun
- air pollution caused by photochemical reactions involving hydrocarbons, nitrogen oxides and other pollutants, especially in still air over cities
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| pileus |
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noun
- the cap of a mushroom.
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| pluvial |
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adjective
- Of, pertaining to, or produced by rain
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| pluviometer |
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noun - (meteorology) A scientific instrument for measuring the amount of rainfall.
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| pluvious |
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adjective
- Of or pertaining to the condition of heavy rain; rainy.
- Sarah sat by the fireplace one pluvious evening.
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| precipitate |
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noun verb adjective |
| pressure |
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noun (countable and uncountable; plural: pressures)
- (physics) The amount of force that is applied over a given area divided by the size of this area.
- Units
- SI: pascal (Pa) (1 pascal equals 1 newton per square metre)
- Others: bar (1 bar equals 100000 pascals), barye (Ba) (1 barye equals 0.1 pascal), pounds per square inch (psi, lbf/in2, lb/in2), torr, mmHg, atmosphere (atm)
- mental strain caused by one's own or others' expectations on one's own performance
- She has been under lately because her boss expects her to get the job done two weeks early.
- Synonyms - under the pump, under the gun
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| pressure gradient |
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noun
- The rate of decrease (gradient) of pressure in space at a fixed time. The term is sometimes used to denote simply the magnitude of the gradient of the pressure field.
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| psychrometer |
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noun
- (meteorology) any of several instruments used to measure the relative humidity of the atmosphere; especially a wet-and-dry-bulb hygrometer
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| psychrometric chart |
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noun psychrometric + chart
(wikipedia, psychrometrics)
- a graph or chart showing the relationships of the thermodynamic properties of moist air
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| psychrometry |
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noun (wikipedia, psychrometrics)
- the measurement or study of the thermodynamic properties of moist air
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| pumping |
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verb
- (present participle of, pump)
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