Possible misspelling? More dictionaries have definitions for
casuist
-- could that be what you meant?
characteristic and useful since it shows that
Since we are engaged in giving details as to what the convent of the Petit-Picpus was in former times, and since we have ventured to open a window on that discreet retreat, the reader will permit us one other little digression, utterly foreign to this book, but characteristic and useful, since it shows that the cloister even has its original figures. — from Les Misérables by Victor Hugo
This tab, called Hiding in Plain Sight,
shows you passages from notable books where your word is accidentally (or perhaps deliberately?)
spelled out by the first letters of consecutive words.
Why would you care to know such a thing? It's not entirely clear to us, either, but
it's fun to explore! What's the longest hidden word you can find? Where is your name hiding?