dictionary.user.js

// ==UserScript==
// @name        Google Dictionary
// @namespace   bo33b
// @description Clean Google Dictionary
// @downloadURL https://gist.github.com/bo33b/41365a417f7fdf842f4d/raw/dictionary.user.js
// @version     5.1.1
// @include     https://www.google.com/search?q=define+*
// @grant       none
// ==/UserScript==

/***bookmarklet:
javascript:void(open(`https://www.google.com/search?q=define+${getSelection()}&tbs=qdr:s#uid_0`,``,`width=580,height=550,top=100,left=${screen.availWidth/2-290},scrollbars=1`));

*/

function gebi(id) {  return document.getElementById(id);  }
document.body.style.overflowX = 'hidden'; //no horizontal scroll
for (var div of document.querySelectorAll('.xpdxpnd')) div.style.maxHeight = 'none'; //expand divs
[
  gebi('top_nav'), //service chooser
  gebi('appbar'), //results stats
  gebi('uid_0').childNodes[1], //expand box
  gebi('bottomads'), //ads
  document.querySelector('.srg'), //search results
  gebi('extrares'), //related searches
  gebi('foot'), //page numbers
  gebi('footcnt'), //page footer
].forEach(function (cV,i,a) {if(cV) cV.outerHTML=''});