Car″di‐oid (?), n. [Gr. καρδιο-ειδήσ heart-shaped; καρδία heart + εἰ̑δοσ shape.] (Math.) An algebraic curve, so called from its resemblance to a heart.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.