Plain English Meaning
Airpark South is the name of an airport that has been shut down with no planned reopening date. If you see it on an old chart or in older flight planning material, it is no longer a place you can land.
Full Definition
Airpark South is the proper name of a specific airport listed in the Instrument Procedures Handbook as having been closed indefinitely. It is not a general aviation term, a category of airport, or a type of facility — it is the identifying name of one particular airfield that no longer accepts operations.
Context Anchor
Seen in instrument procedure and chart discussions about airports marked as closed indefinitely.
Derivation
“Airpark” combines “air,” referring to aviation, with “park,” used for a planned area or facility. In airport names, it often suggests a small airport or aviation community. “South” is part of the proper name and helps distinguish it from other places.