reentrant angle

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Related to re-entrant angle: salient angle

reentrant angle

[rē′en·trənt ‚aŋ·gəl]
(crystallography)
The angle between two plane surfaces on a crystalline solid, in which the external angle is less than 180°.
(mathematics)
An interior angle of a polygon that is greater than 180°.

reentrant angle

An internal angle usually less than 90°.
References in periodicals archive ?
Mok's solution is simply to remove the re-entrant angles of the perimeter block and, in the process, frame magnificent views of mature trees just beyond the boundary of the site.
* improve casting design and avoid metal re-entrant angles. Sharp internal corners create hot spots, which are areas where penetration is more likely occur;
Such shapes will be convex polygons, which can be thought of as polygons with no re-entrant angles. Alternatively, we can use the usual convexity definition: each two points of the figure can be joined by a line segment which lies completely within the figure.