Forgive me if this has already been suggested…
I’d recommend using a memory palace that is as large as you can find (or make it, although I strongly recommend using an actual place you know well). Or, instead, multiple palaces divided by topics/subject areas you’ll need to know.
At the outset, create images for the conjunctions, articles, and prepositional phrases you’re going to need. That way you’ll clearly know if you need an and or an or in a given sentence. If you foresee using multiple ands in a given sentence, you may want to have multiple variations of your “and” image, so you don’t get lost. For example, if “sand” is your image for and, you could use a pile of sand, a sandy beach, sand in an hourglass, etc.
Create images for other words/phrases in the definitions that cannot be misconstrued or interpreted in multiple ways. Not that this would apply in your case, but if you need to remember “bull,” make sure that your image is truly a bull and cannot be misremembered as a cow or some other random barnyard animal.
Finally, try not to overcrowd your locations. I realize you may want each locus to hold all the words for a given definition, but that may get confusing if the locus is overstuffed with information. (One solution may be to place the main word in the locus, then work down vertically from that for the definition, as if the linked images were going down into the floor and then into the ground and deep into the earth.)
Bob