Etymology
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sarcomere (n.)

"structural unit of a muscle," 1891, from sarco-, Latinized combining form of Greek sarx "flesh" (see sarcasm) + -mere, from Greek meros "part," from PIE root *(s)mer- (2) "to get a share of something."

updated on September 23, 2018

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Definitions of sarcomere from WordNet

sarcomere (n.)
one of the segments into which a myofibril is divided;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.