Definition of word(s) on hover or with click on underlined words

My idea is this:

  • Popup bubble (modal), if underlined words are hovered or clicked on
  • In this popup, there could be a definition of word(s).

Nice to have: Basic edtor functionality — links, bold, italics, underline

This is useful for any technical subject on blogs, where I could see myself giving a quick explanation of a technical term with a link to a previous post.