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| the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language). |
| 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. |
| biostratigraphy (bī'ō-strə-tĭg'rə-fē) Pronunciation Key
The study and categorization of rock strata based on their fossil content and distribution. Biostratigraphic data are often considered together with radiometric and paleoenvironmental data as a means of dating rock strata. Compare lithostratigraphy. |