Source : Webster's Revised Unabridged Dictionary (1913)

Tenosynovitis \Ten`o*syn`o*vi"tis\, n. [NL., fr. Gr. te`nwn
   tendon + synovitis.] (Med.)
   Inflammation of the synovial sheath of a tendon.

Tenosynovitis \Ten`o*syn`o*vi"tis\, n. [NL., fr. Gr. te`nwn a
   tendon + E. synovitis.] (Med.)
   Inflammation of the synovial sheath enveloping a tendon.

Source : WordNet®

tenosynovitis
     n : inflammation of the sheath surrounding a tendon