Ordovician Period

Science / Biology / Ordovician Period: Geologic period of the Paleozoic Era after the Cambrian Period between 500 and 435 million years ago. Major advances during this period include the bony fish and possibly land plants (during the late Ordovician).

Other Words for Period

Period Noun Synonyms: interval, time, term, span, duration, spell, space, stretch, while, patch
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Periodontal

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

Periodization

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

Periodicity

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

Periodical Lunation

Science / Astrology / Periodical Lunation: Term applied to the transiting Moon's monthly return to the exact position occupied in a natal horoscope. See also lunar period. MORE

Periodontal Disease

Health / Dentistry / 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 disease or MORE

Periodontal Pocket

Health / Dentistry / 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. MORE

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