Usually means: Hypocycloid with four cusps curve.
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We found 16 dictionaries that define the word Astroid:

General (10 matching dictionaries)
  1. astroid: Merriam-Webster
  2. astroid: Oxford Learner's Dictionaries
  3. astroid: Collins English Dictionary
  4. astroid: Wordnik
  5. astroid: Wiktionary
  6. astroid: Infoplease Dictionary
  7. astroid: Dictionary.com
  8. Astroid: Wikipedia, the Free Encyclopedia
  9. astroid: TheFreeDictionary.com
  10. astroid: Merriam-Webster

Computing (1 matching dictionary)
  1. astroid: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Science (4 matching dictionaries)
  1. Astroid: Visual of Special Plane Curves
  2. A Glossary of Mathematical Terms (No longer online)
  3. Astroid: Eric Weisstein's World of Mathematics
  4. astroid: PlanetMath Encyclopedia

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Definitions from Wiktionary (astroid)

▸ noun:  (geometry) A hypocycloid with four cusps.

Similar:
cylindroid, hypercuboid, hexadecahedroid, cycloidian, star polyhedron, cuboctahedron, hectogon, truncated cuboctahedron, hyperbolic dodecahedron, unduloid, more...

Opposite:
asteroid, comet, meteoroid

Types:
comet, meteor, meteorite, more...

▸ Words similar to Astroid

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Similar:
cylindroid, hypercuboid, hexadecahedroid, cycloidian, star polyhedron, cuboctahedron, hectogon, truncated cuboctahedron, hyperbolic dodecahedron, unduloid, more...

Opposite:
asteroid, comet, meteoroid

Types:
comet, meteor, meteorite, more...



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