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Tanner stage

n.
  1. A stage of puberty in the Tanner growth chart, based on the growth of pubic hair in both sexes, the development of the genitalia in boys, and the development of the breasts in girls.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.