Heterochrony Definition
 hĕtə-rō-krŏnē 
    noun
  
 A change or set of changes in the timing or duration of an organism's ontogenetic development compared with an ancestral species, resulting in morphological differences between ancestor and descendant.
 American Heritage Medicine 
Origin of Heterochrony
- hetero– Greek khronos time –y - From American Heritage Dictionary of the English Language, 5th Edition 
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