1. pointing inward or curving inward
Usage: geometry; technical
2. designed to allow reentry or repeated entry
Usage: technical

1. an inward-pointing angle or corner
Usage: geometry; architecture

Examples

• The fortress had a reentrant angle that provided defensive advantages.
• The coastline featured several reentrant bays along its length.
• Engineers designed a reentrant system for the spacecraft’s heat shield.
• The building’s reentrant corners created interesting shadow patterns.
• The polygon had both salient and reentrant vertices.
• The reentrant design allowed for multiple mission uses.