Towards the bottom of the poem, I added a custom definition (copied from L&S) for "cysitum." The form for creating the definition is in the dictionary pane from the previous picture. In addition to a text definition, you can also add a picture. Once the definition is saved, you can quickly see your definition by hovering over the word when you're reading. You could even follow the Orberg method of having picture-only definitions if you wanted.

The form also lets you select the highlight color for the word. I'm not sure whether there's supposed to be an objective meaning for the different colors or not, but presumably the colors go from least known to most familiar. I marked cysitum orange because I knew it was a plant, but I couldn't remember what kind of plant.

Lute is dumb about inflected forms, but you can link words together with custom definitions by setting the word's parent, and a word can have more than one parent if necessary.