This reminds me of a project a friend of mine worked on, where he wrote a dictionary of all the English one syllable words, but defined only in terms of other o

This reminds me of a project a friend of mine worked on, where he wrote a dictionary of all the English one syllable words, but defined only in terms of other one syllable words. For example "day" would be something like "time in which the sun goes round the earth". Sadly I don't think it's posted online anywhere.