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单词 cissoid
释义 cissoid
 —cissoidal,  adj.  
 /sis"oyd/, n. Geom.
 a curve having a cusp at the origin and a point of inflection at infinity. Equation: r = 2a sin(t)tan(t).
 [1650-60; < Gk kissoeidés, equiv. to kiss(ós) ivy + -oeides -OID]
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