period

period definition - medical

pe·ri·od (pîrˈē-əd)

noun
  1. An interval of time characterized by the occurrence of a certain condition, event, or phenomenon.
  2. One of the stages of a disease.
  3. A menstrual period.
  4. A sequence of elements arranged in order of increasing atomic number.

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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A period of human life126 years ago

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