Thanks @etresoft. This answers my question, and confirms the results of the cursory research I've done.
I have Antidote. Great product. I just need to remember to use it.
I can't help but believe that Mac buyers in France, Italy and Spain get thesauruses (and other resources?) in their native languages, but I haven't thought of anybody I could ask about this. And if they get these resources (especially the thesauruses) there must be some way to get them for my Mac's Dictionary.app.
For comparison purposes, here is the list of resources available to me. (I'm only using the ones with the check marks beside them.)
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And I'll tag this post with terms that Mac owners who use those languages regularly might search for:
dictionnaire des synonymes
dictionnaire analogique
tesauro
diccionario ideológico
diccionario de ideas afines
tesauro