<?php
// Override glossify_links theme function in your template.php file
function themename_glossify_links($vars) {
    global $base_url;
    drupal_add_css(drupal_get_path('module', 'glossify') . '/glossify.css');

    if ($vars['type'] == 'taxonomy') {
        $path = 'taxonomy/term/' . $vars['id'];
    }
    else {
        $path = 'node/' . $vars['id'];
    }

    return l(check_plain($vars['text']), $path, array('html' => true, 'attributes' => array('class' => array('glossify-link'), 'data-glossaryid' => $vars['id'])));
}
?>

// Write some javascript to make the tool tips happen - this is based on bootstrap but could be easily adapted:
(function ($) {
    $(document).ready(function () {
    $('.glossify-link').tooltip({
        html: true,
        title: gettooltip,
        placement: "bottom"
    });
    var cachedTooltipData = Array();

    function gettooltip() {
        var element = $(this);
        var id = element.data('glossaryid');


        if (id in cachedTooltipData) {
            return cachedTooltipData[id];
        }


        var localData = "not found";

        $.ajax(Drupal.settings.basePath + 'rest/node/' + id, {
            async: false,
            dataType: "json",
            success: function (data) {
                localData = data.body.und[0].safe_value;
            }
        });

        cachedTooltipData[id] = localData;

        return localData;
    }
    });
})(jQuery);

// Use the services module to setup a new end point (you can import this definition)
<?php
$endpoint = new stdClass();
$endpoint->disabled = FALSE; /* Edit this to true to make a default endpoint disabled initially */
$endpoint->api_version = 3;
$endpoint->name = 'rest';
$endpoint->server = 'rest_server';
$endpoint->path = 'rest';
$endpoint->authentication = array(
  'services' => 'services',
);
$endpoint->server_settings = array();
$endpoint->resources = array(
  'node' => array(
    'operations' => array(
      'retrieve' => array(
        'enabled' => '1',
      ),
    ),
  ),
);
$endpoint->debug = 0;
?>