Can someone tell me exactly what a Stricture is?

I am 71/2 months post op and for the last 2 weeks or so I get nausaited every time I eat, no matter what it is, even water. I really dont throw up, only 2 or 3 times, but just awful nausia. I entered strictures in search but really found no explanation as to what they actually are.. I have lost 112 lbs and very happy with but am concerned over the nausia. Thanks for your help

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