tropomyosin
noun
tropo·my·o·sin ˌträ-pə-ˈmī-ə-sən 
ˌtrō-
: a protein of muscle that forms a complex with troponin regulating the interaction of actin and myosin in muscular contraction
Example Sentences
Recent Examples on the Web In February, for example, Hyman and co-authors reported in The New England Journal of Medicine that a drug aimed at genes known as tropomyosin receptor kinase (TRK) fusions works for many tumor types. 
Jocelyn Kaiser, Science | AAAS, 24 Apr. 2018
Jocelyn Kaiser, Science | AAAS, 24 Apr. 2018 Word History
Etymology
tropo- + myosin
Note: Name introduced by the British biochemist Kenneth Bailey (1909-63) in "Tropomyosin: a new asymmetric protein component of muscle," Nature, vol. 157, issue 3986 (March 23, 1946), pp. 368-69.
First Known Use
1946, in the meaning defined above
Medical Definition
tropomyosin
noun
tro·po·my·o·sin ˌträp-ə-ˈmī-ə-sən ˌtrōp-
ˌtrōp- : a protein of muscle that forms a complex with troponin regulating the interaction of actin and myosin in muscular contraction