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Last Seven DaysQuestion from College Station, Texas, on March 11, 2026
Answer
Here's the entry, under prefixes:
mid- In addition to the general rules for prefixes, use a hyphen when a figure follows: mid-30s.
In the 57th edition, we moved a bunch of the prefix rules under the entry in the P chapter, including the one for mid. I found it by searching the Stylebook Online.
We're actually just finishing up the 58th Edition, if you can believe that! You'll be able to order new edition here, or sign up for Stylebook Online.
Hope this helps!
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