tenosynovitis
noun
te·no·syn·o·vi·tis ˈte-nō-ˌsi-nə-ˈvī-təs 
ˈtē-
: inflammation of a tendon sheath
Example Sentences
Recent Examples on the Web The doctor saw him right away, and diagnosed the condition as flexor tenosynovitis, an inflammation of the tendon inside of its sheath. 
Todd Masson, NOLA.com, 26 June 2017
Todd Masson, NOLA.com, 26 June 2017 Word History
Etymology
ten- (from Greek tenont-, ténōn "sinew, tendon") + -o- + synovitis — more at tendon
First Known Use
circa 1860, in the meaning defined above
Medical Definition
tenosynovitis
noun
teno·syn·o·vi·tis ˌten-ō-ˌsin-ə-ˈvīt-əs
: inflammation of a tendon sheath
called also tendovaginitis, tenovaginitis