reentrant

American  

[ree-en-truhnt] / riˈɛn trənt /

Or re-entrant

adjective

1. reentering or pointing inward.

   a reentrant angle.

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noun

1. a reentering angle or part.

2. a person or thing that reenters or returns.

   Reentrants to the engineering program must take the introductory course again.

3. Physical Geography. a prominent indentation in a coastline.

Etymology

Origin of reentrant

First recorded in 1775–85; re- + entrant