Reentrant or re-entrant can refer to:
- Re-entrant (landform), the low ground formed between two hill spurs.
- Reentrancy (computing) in computer programming
- Reentrant mutex in computer science
- Reentry (neural circuitry) in neuroscience
- Salients, re-entrants and pockets in military tactics
- Reentrant tuning in music
- Concave polygon, AKA reentrant polygon
See also
- Reentry
- Reentrant dysrhythmia, a type of cardiac arrhythmia
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