| periodontist |
a specialist who treats the gums and supporting structures of the teeth
출처: www.egyptdentists.com/cgi-bin/gforum/gforum.cgi
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| periodic table |
Early alchemists understood that certain elements could be grouped together due to the properties that they had. But it was not until the 18th century that Lavoisier tried to classify the known elements. It took another 100 years and a lot of trial and error for Mendeleev to propose a real foundation for the modern periodic table. He arranged the elements in a table according to relative atomic mass and left gaps where an element did not match. ...
출처: www.ch.ic.ac.uk/vchemlib/mol/glossary/
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| period |
The time needed for an orbiting body to complete one revolution about another body.
출처: astronomy.nju.edu.cn/astron/AT3/GLOSS_P.HTM
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| periodontal disease |
disease of the tissues around a tooth.
출처: www.ncpublicschools.org/curriculum/health/scos/07g...
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| period |
The time required to complete one cycle of AC and is calculated as the reciprocal of the frequency (1/f). It is measured in seconds and designated with the letter T.
출처: www.nuhorizons.com/Glossary/BasicElecConcepts.html
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