Definition of biceps in US English:



  • 1Any of several muscles having two points of attachment at one end.

    • ‘When given from the brachial trunk, the radial recurrent has been found crossing beneath the tendon of the biceps.’
    • ‘Once thawed, the proximal two-thirds of the radii were harvested along with their distal biceps tendon attachments.’
    • ‘The triceps is a forearm extensor, the opposite of the biceps.’
    • ‘The articular surfaces and biceps tendon attachment were found to be normal.’
    • ‘An instance of the origin of the long tendon of the biceps from the tendon of pectoralis major is described by Koster.’
    1. 1.1 A large muscle in the upper arm which turns the hand to face palm uppermost and flexes the arm and forearm.
      ‘he clenched his fist and exhibited his bulging biceps’
      • ‘The tendinitis signs and symptoms can be of the rotator cuff or of the long head of the biceps brachii muscles, or both.’
      • ‘There are two primary muscles on the front of your upper arm: the biceps brachii and the brachialis.’
      • ‘There are thirty-two segments devoted to a particular muscle, such as temporalis, masseter, sternocleidomastoid, biceps brachii and so on.’
      • ‘Major flexors include the biceps brachii (which also supinates the forearm when the elbow is flexed), brachioradialis and brachialis muscles.’
      • ‘It is also known as the bicipital groove because it carries the tendon for the long head of the biceps brachii muscle.’
    2. 1.2 A muscle in the back of the thigh which helps to flex the leg.
      • ‘Most muscle strains occur in the lower extremities with the rectus femoris and biceps femoris muscle being most commonly affected; they are followed by the semitendinosus, adductors, vastus medialis and soleus.’
      • ‘The nerve to the short head of the biceps femoris sometimes arises directly from the sacral plexus.’
      • ‘The biceps femoris muscle has been documented as the most commonly injured hamstring muscle, and this study verifies this finding.’
      • ‘The hamstrings are comprised of three separate muscles, the biceps femoris, semitendinosus and semimembranosus.’
      • ‘The biceps femoris muscle was involved in 81% of all injuries and was the sole or predominant muscle injured in 72% of injuries.’


Mid 17th century: from Latin, literally ‘two-headed’, from bi- ‘two’ + -ceps (from caput ‘head’).