Definition of body mass index in English:

body mass index

Syllabification: bod·y mass in·dex
(abbreviation: BMI)

noun (plural body mass indices /-dəsēz/ or body mass indexes)

A weight-to-height ratio, calculated by dividing one’s weight in kilograms by the square of one’s height in meters and used as an indicator of obesity and underweight.
More example sentences
  • Height, weight, calculated body mass index, and blood pressures were recorded.
  • We calculated body mass index from measured height and weight.
  • Patients' weight and height were measured and their body mass index calculated.

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