The Collaborative International Dictionary of English v.0.48:
Tenosynovitis \Ten`o*syn`o*vi"tis\, n. [NL., fr. Gr. te`nwn a tendon + E. synovitis.] (Med.) Inflammation of the synovial sheath of a tendon. [1913 Webster]WordNet (r) 3.0 (2006):
tenosynovitis n 1: inflammation of a tendon and its enveloping sheath [syn: tenosynovitis, tendosynovitis, tendonous synovitis]