The basic idea here is that you can easily link to the wikipedia entry for a given topic by putting the [wikipedia]topic[/wikipedia] tag into your post. The tag is replaced by a link that executes the wikipedia search form for that topic.
The plan is to augment this with a mouseover popup containing an excerpt from the wikipedia page.

Wp-Wikipedia-Excerpt

This plugin replaces [wikipedia]topic[/wikipedia] with a wikipedia search link for that term.

Dominik Fehr

The «Summary box for Wikipedia links» plugin brings the <a href="https://www.mediawiki.org/wiki/Page_Previews" rel="nofollow ugc">Page Previews</a> from WikiMedia to your website. It displays simple and nice summary boxes on every Wikipedia link.
Immediately after activating the plugin, you get nicely animated summary boxes for all existing and new Wikipedia links on your site! 
All without touching your source code in any way, so you can try it out without hesitation.
Authors and visitors love it! ❤️
<ul>
<li>Simplifies content creation by providing on-demand term explanations. </li>
<li>Connects your visitors to Wikipedia’s wealth of knowledge. </li>
<li>Enhances your site with a simple, valuable, useful and nice feature!</li>
</ul>
This plugin …
<ul>
<li>Works out of the box, just set a Wikipedia link as usual and the summary box appears.</li>
<li>Works smoothly with touch and mouse on mobile, desktop and tablet.</li>
<li>Supports all existing languages and text directions (ltr, rtl) on Wikipedia.</li>
<li>Does not affect your website in any way.</li>
<li>Is based on our library that can bring this feature to any website, not just WP, first release was 12/2021.</li>
<li>Is very lightweight, free and open source.</li>
</ul>
Settings. You have control over whether to …
<ul>
<li>Show summary boxes for all Wikipedia links, or none but only show selected ones. </li>
<li>Show images in all boxes, or none but also only in selected ones.</li>
<li>Display or hide each box and each image within it separately.</li>
<li>Change the width of the summary boxes, the number of characters displayed, the font size and more.</li>
</ul>
Best of all, using the settings it’s really simple, but in most cases you don’t need them at all, just activate the plugin and see if you like it.
Examples 
<a href="https://su-pa.net/wikiPrevBox/" rel="nofollow ugc">Try it out on our project page</a> (su-pa.net). 
<a href="https://dontwastemy.energy/2023/05/23/video-games-and-the-environment-how-are-they-related/" rel="nofollow ugc">Use on our website dontwastemy.energy</a>
Links related to the plugin 
<a href="https://su-pa.net/wikiPrevBox/" rel="nofollow ugc">Project page</a> (su-pa.net) 
<a href="https://github.com/su-pa/Summary-box-for-Wikipedia-links_WordPress-Plugin/" rel="nofollow ugc">Plugin source code</a> (github.com) 
<a href="https://supa.cyon.site/" rel="nofollow ugc">Plugin test page</a> (cyon.site) 
<a href="https://github.com/su-pa/Summary-box-for-Wikipedia-links" rel="nofollow ugc">Source code of the library for any site</a> (github.com)
Give it a try! 
Thank you very much.
Donate 
The first version was created for our “The Horse” project, which supports cross-border student learning and collaboration projects. If you find the plugin helpful, please consider supporting the development by donating to <a href="https://the-horse.education" rel="nofollow ugc">THE ! association</a>.
For suggestions or inquiries, feel free to contact us 
Dominik, wikinick@su-pa.net.

Summary box for Wikipedia links

Enhance your site with Wikipedia summary boxes! Offer instant info previews on existing and new Wikipedia links without altering your website code.

Wp-Wikipedia-Excerpt vs Summary box for Wikipedia links