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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