Definition of cephalic index
: the ratio multiplied by 100 of the maximum breadth from side to side of the head to its maximum length from front to back in living individuals — compare cranial index
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“Cephalic index.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cephalic%20index. Accessed 15 Jun. 2021.
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The first known use of cephalic index was in 1866
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