Origin of turnverein
- German turnen to do gymnastics turner2 Verein club (from obsolete vereine) (back-formation from Middle High German vereinen to unite) (ver- intensive pref.) (from Old High German far- per1 in Indo-European roots) (einen to make one) (from ein one) (from Old High German oi-no- in Indo-European roots)
From American Heritage Dictionary of the English Language, 5th Edition
- German, from turnen to exercise + Verein a union.