encephalization quotient

/EH0 N S EH0 F AH0 L IH0 Z EY1 SH AH0 N K W OW0 SH AH0 N T/
noun
  1. 1

    (biology) Relative brain size measure defined as the ratio between observed to predicted brain mass for an animal of a given size, based on nonlinear regression on a range of reference species.

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