As far as dictionaries go, LookUp is a real looker: The app’s Word of the Day feed is full of colorful illustrations, each representing a new (and often esoteric) word.
These images do more than make for a prettier dictionary: They’re also a surprisingly effective way to help you remember all of those definitions.
For example, malleate (to beat into shape with a hammer) appears in a bold font, paired with a drawing of a hammer. Pronk (to jump with all four limbs at once) is shown with four-legged animals leaping. And smaragdine (having the color of emeralds) places the word, along with the gem, on a dark-green background.
Like any good dictionary, LookUp also lets you search for words, providing the definition, etymology, beginning of its Wikipedia entry if available, and a click-to-play pronunciation guide.
So challenge yourself to learn a new word a day. Start with tarantism (an extreme urge to dance), perhaps. Drop it in conversation and see how many raised eyebrows you get.