I just read this sentence...

...in a book about writing essays:

"...when writing essay-style answers under exam conditions, you will not have a lengthy period to respond to the set task, and will be expected to perform under time pressure, without aids like dictionaries and thesauri and with very limited scope to review, edit and..."

Hold on a minute! Rewind! "...thesauri?!"

(here's an unrelated picture of
the back of my head to break up the text...)

Whenever I’ve been referring to multiple copies of books of the synonym providing variety (which, as you can imagine, is like every other day) ...I’ve always said ‘thesauruses’. (It turns out that’s also a word... but obviously not the proper one if a real and actual book which got published says ‘thesauri’.)

Int'resting!

♥

Anyway... on another note, here's a great bargain I found in Morrisons over the weekend. Don't all be rushing at once now!

(Sentence is from p.229 of How to Write Essays and Assignments by Kathleen McMillan and Jonathan Weyers, 2009)