pyro-, pyr-

(Greek: fire, burn, burning, heat, produced by heating, hot; and sometimes also referring to "fever as shown at this link")

pyrophoric
1. Bursting into flames spontaneously when exposed to air.
2. Producing sparks when struck: giving off sparks when struck or scraped.
3. From pyrophorus, a substance that ignites spontaneously
pyrophoric alloy
1. An alloy such as ferrocerium that produces a spark when struck with metal (steel) at an angle; used for automatic cigarette lighters.
2. An alloy in powder form that spontaneously oxidizes in air, reaching high temperatures.
pyrophotograph
A photographic picture burnt in on glass or porcelain.
pyrophotographic
A reference to, or of the nature of a pyro-photograph, or of pyro-photography.
pyrophotography
A process in which heat is used to fix a photographic picture.
pyrophyte
A plant that is resistant to, or tolerates, fire or which needs fire to reproduce.
pyroplastic
1. The condition of a clay body in the kiln when heated to vitrification. At this point, any impact upon the pot may alter its shape, and, ultimately, it may begin to sag under its own weight.
2. Pyroplastic rocks are those that have been formed by fire: "The rock and dirt that made the top of the mountain was pulverized in the explosions, and was carried down the mountainside in a series of blasts of hot air called pyroplastic flows."
3. Rocks that have been formed by high viscosity lavae with a high percentage of glass, or by pyroplastic materials (ignimbrites) are derived from explosive activities.

Examples in which the term pyroplastic is used:

  1. In AD 79, Vesuvius did it's worst with lots of pumice (which didn't really pose that much of a danger in this case, because it was so light) and a number of pyroplastic flows (extremely hot choking burning winds with lots of ash, hot unbreathable gas and debris) finally finished the place off and the Romans never reinhabited the site.
  2. A town completely preserved underneath the ash of a volcanic pyroplastic explosion.
  3. Pyroclastic flows are a majestic sight. It's easy to be led into a false sense of security by their beauty.
  4. With reference to Mt. Saint Helens (May 18, 1980): The eruption cloud eclipsed the sun in Yakima which is roughly 150 miles away from the mountain itself, and the ash choked cities thousands of miles away as the volcanic plume traveled all the way around the globe, taking the pollution it carried with it.
  5. The eruption also created a lehar (a volcanic mudslide consisting of mud, rock and water that is much like wet concrete) that traveled 100 miles from the blast zone and also destroyed almost everything in its path.
  6. Some even argue that lehars are the most lethal part of a volcanic eruption, although others argue that it is actually the pyroplastic flow.
pyroplasticity
1. Formed, or shaped, by the strong heat of flames.
2. Clay bodies exhibit pyroplasticity when they are fired.

Basically they get soft again in the heat of the kiln and can deform under their own weight.

pyroptothymia
A delusion in which one imagines being surrounded, or enveloped, by flames.
pyropuncture (s) (noun), pyropunctures (pl)
Physical treatment by puncture of a body part with hot needles.
pyroscope
1. An instrument for measuring the pulsatory motion of the air, or the intensity of heat radiating from a fire.
2. A pyrometer that uses the color of the light emitted by a hot object.
3. An instrument for measuring the intensity of heat radiating from a fire.
pyroseism
Tremors (quakes) caused by volcanic eruptions.
pyroseismic
A reference to tremors (quakes) resulting from volcanic eruptions.
pyrosis, acid reflux
1. A technical medical term for what is popularly called "heartburn", a burning sensation in the upper abdomen.
2. An uncomfortable burning sensation in the lower chest, usually caused by stomach acid flowing back into the lower end of the esophagus.
3. A burning sensation, usually centered in the middle of the chest near the sternum, caused by the reflux of acidic stomach fluids that enter the lower end of the esophagus.
pyrosome
The pyrosomes form large hollow cylinders, sometimes two or three feet long, which swim at the surface of the sea and are very phosphorescent or bioluminescent.

Cross references of word groups that are related, directly, indirectly, or partly to: "fire, burn, glow, or ashes": ars-, ard-; -bust; cand-, cend-; caust-, caut-; crema-; ciner-; ether-; flagr-; flam-; focus, foci-; fulg-; gehenna-; ign-; phleg-; phlog-; pyreto-, -pyrexia; spodo- (ashes; waste); volcan-.