Permian Period: The last geologic time period of the Paleozoic Era, noted for the greatest mass extinction in earth history, when nearly 96% of species died out.

 

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Permian Period: The last geologic time period of the Paleozoic Era, noted for the greatest mass extinction in earth history, when nearly 96% of species died out.

Periodontal: Relating to the tissue and bone that supports the tooth (from peri, meaning 'around,' and odont, 'tooth').

Periodization: A method of organizing a strength training workout program into several periods, each lasting about four weeks. Each phase has a different emphasis.

Periodicity: The level of detail in terms of time at which data is forecast or reported, specified as months, quarters, or years.

Periodontal Disease: The inflammation and infection of gums, ligaments, bone, and other tissues surrounding the teeth. Gingivitis and periodontitis are the two main forms of periodontal disease. Also called gum . . . View Full Definition

Periodontal Pocket: An abnormal deepening of the gingival crevice. It is caused when disease and infection destroy the ligament that attaches the gum to the tooth and the underlying bone.

Periods Of English Literature: The common historical eras scholars use to divide literature into comprehensible sections through periodization. Dividing literature into these sometimes arbitrary periods allows us to bette . . . View Full Definition

Periods: Discrete intervals of time. The word period generally refers either to the interval of the entire forecast (as in forecast period) or the granularity of data in financial statements (as in p . . . View Full Definition

Periodontitis: Inflammation of the supporting structures of the tooth, including the gum, the periodontal ligament, and the jawbone.

Periodontal Surgery: A surgical procedure involving the gums and jawbone.