sarcosome
noun
sar·co·some ˈsär-kə-ˌsōm 
: a mitochondrion of a striated muscle fiber
sarcosomal
ˌsär-kə-ˈsō-məl
adjective 
Word History
Etymology
borrowed from German Sarkosoma, from sarko- sarco- + -soma -some entry 3
First Known Use
1899, in the meaning defined above
Medical Definition
sarcosome
noun
sar·co·some ˈsär-kə-ˌsōm
: a mitochondrion of a striated muscle fiber