Ever wonder what a caparison was? a garderobe? Outremer?
If you are interested, fascinated or frustrated by words you don’t understand in books relating to the medieval world take a look at Madeleine Pelner Cosman, Medieval Wordbook and/or this excellent website: http://www.shadowedrealm.com/glossary/
Did you know for example that energumens were people possessed by demons?