Plain English Meaning
The screen a controller or pilot looks at to see what the radar is picking up.
Full Definition
The display screen on which a radar system shows returns from objects within its coverage area. It presents the position, distance, and movement of aircraft, weather, or terrain detected by the radar antenna.
Context Anchor
Seen in radar navigation and air traffic control discussions, especially when describing what a controller sees while providing radar service.
Derivation
From 'radar' (itself short for 'radio detection and ranging') plus 'scope,' from the Greek 'skopein' meaning 'to look at' or 'to view.' A radarscope is literally the device you look at to view radar information.