Final answer:
Peaches that have flesh adhering to the pit are known as clingstone, which is the opposite of freestone.
Step-by-step explanation:
Peaches are classified as either freestone or clingstone, depending on how the flesh of the fruit adheres to the pit. The option where the flesh adheres to the pit, which is the opposite of freestone, is known as clingstone. The other options provided, such as loosetone, pitstone, and stonestone, are not recognized terms for classifying peaches.