myofibroblast
noun
myo·fi·bro·blast
| \ -ˈfīb-rə-ˌblast
, -ˈfib-
\
, -ˈfib-
\
Medical Definition of myofibroblast
: a fibroblast that has developed some of the functional and structural characteristics (as the presence of myofilaments) of smooth muscle cells