| pyracanth | (noun) any of various thorny shrubs of the genus Pyracantha bearing small white flowers followed by hard red or orange-red berries | Synonyms: fire thorn, firethorn, Pyracantha |
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| pyralid | (noun) usually tropical slender-bodied long-legged moth whose larvae are crop pests | Synonyms: pyralid moth |
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| pyramid | (noun) (stock market) a series of transactions in which the speculator increases his holdings by using the rising market value of those holdings as margin for further purchases | - |
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| (noun) a polyhedron having a polygonal base and triangular sides with a common vertex | - |
| pyramiding | (noun) a fraudulent business practice involving some form of pyramid scheme e.g., the chain of distribution is artificially expanded by an excessive number of distributors selling to other distributors at progressively higher wholesale prices until retail prices are unnecessarily inflated | - |
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