pyramid |
a geometrical solid with a polygonal base from each side of which a triangle extends to a common point. [10 definitions] |
pyramidal |
of, concerning, or resembling a pyramid. |
pyre |
a stack of material, esp. wood, used for burning a dead body. |
Pyrenees |
a range of mountains between France and Spain. |
pyrethrum |
any of various chrysanthemums grown for their colorful flowers and for the preparation of an insecticide and ointment. [2 definitions] |
pyretic |
of, relating to, causing, or affected by fever. |
Pyrex |
trademark for glassware that resists heat and chemical abrasiveness, used esp. in cookware and laboratory utensils. |
pyridine |
a colorless flammable liquid obtained by distilling coal tar or bone oil and used in synthesizing drugs and vitamins, as a solvent, and to denature alcohol. |
pyridoxine |
vitamin B6. |
pyrimidine |
an organic compound that is the fundamental form of certain bases that are constituents of nucleic acids. [2 definitions] |
pyrite |
a common yellowish metallic mineral used as a source of iron and in the production of sulfuric acid; fool's gold. |
pyrites |
any of a wide variety of minerals, such as pyrite, containing a metal and sulfur. |
pyro- |
fire; heat. |
pyroclastic |
relating to or consisting of fragments of rock that were formed by volcanic or igneous activity. |
pyroelectricity |
an electrical charge produced in certain crystals as a result of temperature changes. |
pyrography |
the art, practice, or process of burning designs on wood, leather, or the like with a heated tool or a flame. [2 definitions] |
pyrolysis |
chemical decomposition or change induced by heat. |
pyromania |
a psychological disorder characterized by the overpowering desire to start fires. |
pyrometer |
an electrical instrument used to measure high temperatures. |
pyrophoric |
of certain metals, capable of igniting spontaneously in air or within a nuclear reactor. |
pyrosulfuric acid |
a corrosive acid used in the making of explosives and dyes. |