re-entrant

/ri:'entrənt/
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re-entrant

A polygon with re-entrant angles is drawn on the chalkboard.

Definition
  1. Adjective:
    • (Geometry) Pointing inward; concave: Describes an interior angle of a polygon that is greater than 180 degrees, causing the shape to indent or cave inward at that vertex. This creates a non-convex or concave polygon.
Usage
  • The term "re-entrant" is primarily used in geometry, computer science (e.g., re-entrant code), and related technical fields. As an adjective, it typically modifies nouns like "angle," "polygon," or "code."
  • Example: "A star shape is a classic example of a polygon with re-entrant angles."
Examples
  • Adjective:
    • The bay formed a re-entrant curve in the coastline. (Here, it describes a geographical feature that curves inward.)
    • In programming, a re-entrant function can be safely interrupted and called again before the previous execution is complete.
    • The surveyor noted the re-entrant angle in the property boundary.
Advanced Usage
  • "Re-entrant angle": The specific term for an interior angle greater than 180 degrees in a polygon.
    • The letter 'L' has one re-entrant angle.
  • "Re-entrant polygon": A polygon that has at least one re-entrant angle; also known as a concave polygon.
    • A crescent moon shape can be approximated by a re-entrant polygon.
Variants and Related Words
  • Reentrancy (n): The property of being re-entrant, especially in computing.
    • Thread safety often depends on the reentrancy of the function.
  • Reenter (v): To enter again. (Note: This is the verb form from which "re-entrant" is derived, but it is a separate word with a broader, non-technical meaning).
  • Concave (adj): A more general synonym for curving inward.
Synonyms
  • Concave: Curved inward like the interior of a circle or sphere. (A general synonym, but "re-entrant" is more specific to angles and polygons).
  • Inward-pointing: A descriptive synonym.
Antonyms
  • Salient (adj): Pointing outward; projecting. In geometry, a salient angle is less than 180 degrees.
  • Convex (adj): Curving outward. A convex polygon has all interior angles less than 180 degrees.
re-entrant

A polygon with re-entrant angles is drawn on the chalkboard.

Adjective
  1. (of angles) pointing inward
    • a polygon with re-entrant angles

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