wordpress- query by custom taxomimy

gistfile1.txt

 $member =  new WP_Query(
                array(
                    'post_type' => 'post',
                    'orderby' => 'menu_order',
                    'order'   => 'DESC',
                    'post_status' => 'publish',
                    'posts_per_page' => -1,
                    'tax_query' => array(
                        array(
                            'taxonomy' => 'taxonomy',
                            'field' => 'slug',
                            'terms' => 'taxonomy-slug'
                        )
                    )
                )
            );