/ree en"treuhnt/ , adj.
1. reentering or pointing inward: a reentrant angle.
n.
2. a reentering angle or part.
3. a person or thing that reenters or returns: Reentrants to the engineering program must take the introductory course again.
4. Physical Geog. a prominent indentation in a coastline. Cf. salient (def. 6).
Also, re-entrant .
[ 1775-85; RE- + ENTRANT ]