Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: 'further behind', from posterus 'coming after', from post; POST-

posterior

1 adjective
     
pos‧te‧ri‧or1 [only before noun]
technical near or at the back of something [≠ anterior]:
the posterior part of the brain
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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