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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. |
| opposition to the withdrawal of state support or recognition from an established church, esp. the Anglican Church in 19th-century England. |
periodicity pe·ri·o·dic·i·ty (pĭr'ē-ə-dĭs'ĭ-tē)
n.
The quality or state of being periodic; recurrence at regular intervals.
The tendency of chemical elements to have similar properties when arranged according to their atomic number.
The position of an element in the periodic table.