"...explore the expanding genre of interactive multi-media visual dictionaries by looking at two very different options. The first by Merriam-Webster and QA International, the Visual Merriam-Webster; the second is Visuwords."
...organized by themes....image(s)...mono- or multilingual.... index of all defined words...included...that defines the word
According to Wikipedia - another 21st-Century tool (albeit developed in the late 20th century):
A visual dictionary is a dictionary that primarily uses pictures to illustrate the meaning of words.
Visual dictionaries are often organized by themes, instead of being an alphabetical list of words.
For each theme, an image is labeled with the correct word to identify each component of the item in question.
Visual dictionaries can be monolingual or multilingual, providing the names of items in several languages.
An index of all defined words is usually included to assist finding the correct illustration that defines the word.
Via Beth Dichter, Sandrine Pac-Kenny, Juergen Wagner, Paz Barceló