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单词 cissoid
释义

WordReference Random House Unabridged Dictionary of American English © 2024
cis•soid  (sisoid),USA pronunciation n. [Geom.]
  1. Mathematicsa curve having a cusp at the origin and a point of inflection at infinity. Equation:r= 2a sinθtanθ.
  • Greek kissoeidé̄s, equivalent. to kiss(ós) ivy + -oeidēs -oid
  • 1650–60
cis•soidal, adj. 

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