Definition of Astroid

1. Noun. (geometry) A hypocycloid with four cusps. ¹

¹ Source: wiktionary.com

Definition of Astroid

1. a four cusped geometrical figure [n -S]

Medical Definition of Astroid

1. Star-shaped. Origin: G. Astroeides, fr. Astron, star, + eidos, resemblance (05 Mar 2000)

Lexicographical Neighbors of Astroid

astrogeophysical
astrogeophysicist
astrogeophysicists
astrogeophysics
astroglia
astroglia cell
astroglial
astroglioses
astrogliosis
astrognosy
astrograph
astrographic
astrographies
astrographs
astrography
astroid (current term)
astroids
astroinformatics
astrointerferometer
astrointerferometers
astroite
astroites
astrokinetic
astrolabes
astrolater
astrolaters
astrolatry
astrolaw
astrolithology

Literary usage of Astroid

Below you will find example usage of this term as found in modern and/or classical literature:

1. An Elementary Treatise on the Differential Calculus Founded on the Method of by William Woolsey Johnson (1904)
"The Four-cusped Hypocycloid or astroid. 292. The four-cusped hypocycloid may be generated by a rolling ... This curve is sometimes called the astroid. ..."

2. An Elementary Course of Infinitesimal Calculus by Horace Lamb (1897)
"The volume generated by the revolution of the astroid about the line joining two opposite cusps is 21. The length of a quadrant of the curve x = a cos2 6, ..."

3. Outlines of Zoology by John Arthur Thomson, Marion Isabel Newbigin (1906)
"<•) astroid stage.—The chromatin elements bend into looped pieces, which are disposed in ... Coil. ~ Coil. / a Resting stage. Resting stage. % /\ c astroid. ..."

4. Analytic Geometry by Wallace Alvin Wilson, Joshua Irving Tracey (1915)
"In the hypo- cycloid R = 4 r, the- rolling circle makes four revolutions in passing around the base, forming the astroid, or hypocycloid of four cusps. 128. ..."

5. Outlines of zoology by John Arthur Thomson (1895)
"(regressive changes). a Resting stage. Resting stage. i; 6 Coil. Coil. / i astroid. ... e —^- if Division of astroid and its loops ..."

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