astroid definition

  • noun:
    • A hypocycloid with four cusps.
    • In heraldry, just like mullet.
    • an airplane curve associated with sixth class and fourth order, having two conjugate diameters of a conic together with range at infinity as inflectional tangents.
    • A hypocycloid with four cusps.
    • In heraldry, same as mullet.
    • an airplane curve associated with 6th course and fourth purchase, having two conjugate diameters of a conic while the range at infinity as inflectional tangents.

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