biceps vs brachium

biceps

noun
  • The upper arm, especially the collective muscles of the upper arm. 

  • A point in a metrical pattern that can be filled either with one long syllable (a longum) or two short syllables (two brevia) 

  • Specifically, the biceps brachii, the flexor of the elbow. 

  • Any muscle having two heads. 

brachium

noun
  • The upper arm. 

How often have the words biceps and brachium occurred in a corpus of books? (source: Google Ngram Viewer )