J77 said:
They'll love you. Even the use of a red pen...
I'm loving that nice touch too. If there were a single error, fine, I'd chalk it up to a typo or some such, but when every definition had errors...and major ones mixing up parts of speech...I support this action fully (I still would have attached an added note requesting a parent-teacher conference, because something that bad does require discussion).
Do you have the term "helicopter parent" in the US?
We have the term, but it doesn't apply in this case. When the teacher is that bad, and that wrong, it is a parent's obligation to speak up for their child. Helicopter parents are the ones who do their kids' homework for them, show up to school constantly to make sure everything is "just so" and worse, the ones who appear at colleges with their adult children to resolve every problem for them when their kid should be learning to solve their own problems. For a 7th-grader, this isn't a playground conflict that they should be learning to resolve on their own, but a problem with a teacher that should involve the parents.
Reading your further posts, I see you're sensitive on your wife's behalf, but as long as she's a good teacher, you shouldn't be. I think everyone here is educated enough to know there are both good and bad teachers. Sure, good teachers often don't get enough thanks for their efforts or feedback from prinicipals saying that it's recognized they are doing their job well, but it's the bad teachers we worry about. For someone teaching 7th grade English, something like writing out correct definitions, knowing how to use a dictionary herself to check the definitions, and properly identifying parts of speech should be second nature. If she's going to give out the definitions, she ought to check them herself.
Now, for a few more technical points related to the rest of the discussion:
Pros vs cons of kids looking up their own definitions- no, it doesn't ensure they will get the right definition, but that's part of the exercise. We had to look up the definitions and turn them in for grading, and then we got the correct definitions. Getting feedback on whether we had chosen the correct definition out of the several in the dictionary was as much a part of the lesson as just cracking open a dictionary.
Use of the word "cretin" - I don't know what context the book used. The medical disorder characterized by a congenital thyroid hormone deficiency is termed "cretinism." In modern society, one would NOT refer to those afflicted by this ailment as "cretins" unless they were incredibly rude. To use it as a term for the sufferers of the disorder is indeed an archaic usage, although this is the origin of its use as a derogatory term for someone.