[ 'trʌɪsɛps ]
■ noun ( plural same) Anatomy any of several muscles having three points of attachment at one end, particularly (also ~ brachii 'breɪkɪʌɪ ) the large muscle at the back of the upper arm.
Origin
C16: from L., lit. 'three-headed', from tri- 'three' + -ceps (from caput 'head').