Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Modern Latin
Origin: biceps, from Latin, 'two-headed', from caput 'head'; because it is attached in two places

bicep

 noun
     
Related topics: Human
bi‧cep [countable usually plural]
HBH the large muscle on the front of your upper arm:
He had an eagle tattoo on one of his biceps.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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