(Especially of food) not preserved.The hull breach had contaminated the galley stores and ruined most of the unpreserved food....
The supermarket is a huge store full of food in cans, bags, and "fresh", that is, unpreserved but stuffed with disgusting steroids and grown in artificial fertilizer.
In some cases when food is uncooked, unpreserved, and no oxygen is present, anaerobic bacteria, like the one that causes botulism, can flourish.