function terminliste (){
  // Find connected pages
    $connected = new WP_Query( array(
        'connected_type' => 'seminar_zu_termin',
        'connected_items' => get_queried_object(),
        'nopaging' => true,
    ) );


    // Display connected pages
    if ( $connected->have_posts() ) {
   ...
      }
}