astroid

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Related to Tetracuspid: tricuspid

astroid

(ˈæstrɔɪd)
n
(Mathematics) maths a hypocycloid having four cusps
[C19: from astro- + -oid]
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References in periodicals archive ?
Internal series with 5 teeth; teeth at symphysis tetracuspid and asymmetric: proximal cusp small, second cusp largest, and following cusps gradually smaller; other teeth pentacuspid and symmetrical; in ventral view cusps forming an arch with concave frontal surface.