What is the simplest way to get a Wiktionary definition working in my Chrome extension?

Question

This person has a very simple translation script working on the Wiktionary API.

How would I go about modifying this to return some dictionary definitions for English words?

http://jsfiddle.net/karlb/PxfrJ/11/

function show_result(data) {
    $("#result ul").text('');
    $.each(data.query.pages, function(page_id, page) {
        if (page.iwlinks === undefined) {
            $("#result ul").append('no results');
            return false; // break
        }
        $.each(page.iwlinks, function(i, el) {
            var trans = el['*'];
            trans = trans.replace('Special:Search/', '').replace('_', ' ');
            $("#result ul").append('<li>' + trans + '</li>');
        });
    });
    $("#result").fadeIn('fast');
}

function translate() {
    $("#result").fadeOut('fast');
    $.ajax({
        url: 'http://' + $('#from').val() + '.wiktionary.org/w/api.php',
        data: {
            action: 'query',
            prop: 'iwlinks',
            format: 'json',
            iwlimit: 30,
            iwprefix: $('#to').val(),
            titles: $('#word').val()
        },
        dataType: 'jsonp',
        success: show_result
    });
    return false;
}

$('form').submit(translate);
$('#word').focus();