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| a white, crystalline, water-insoluble solid, C14H9Cl5, usually derived from chloral by reaction with chlorobenzene in the presence of fuming sulfuric acid: used as an insecticide and as a scabicide and pediculicide: agricultural use prohibited in the U.S. |
| the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language). |
pyelography py·e·log·ra·phy (pī'ə-lŏg'rə-fē)
n.
X-ray photography of the pelvis of the kidney and associated structures after injection with a radiopaque dye. Also called pyeloureterography, ureteropyelography.