turn·ver·ein 
(tûrn
v
ə-r
īn
′, t
rn
-)
n. Sports A club of gymnasts or tumblers.
[German : turnen, to do gymnastics; see TURNER2 + Verein, club (from obsolete vereine, back-formation from Middle High German vereinen, to unite : ver-, intensive pref. from Old High German far-; see per1 in the Appendix of Indo-European roots + einen, to make one, from ein, one, from Old High German; see oi-no- in the Appendix of Indo-European roots).]