conchoid


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conchoid

[′käŋ‚kȯid]
(mathematics)
A plane curve consisting of the locus of both ends of a line segment of constant length on a line which rotates about a fixed point, while the midpoint of the segment remains on a fixed curve which does not contain the fixed point.
References in periodicals archive ?
2] in the above three polynomial equations we get an implicit equation in u and v that describes the conchoid of Nicomedes (see [4] for a more technical specification).
Thus, Shelley is known in this internal and unusually revealing way as "the Conchoid," "the Paladin" and "the Elfin Knight"; Mary Shelley is "the Maie" and "Pecksie" (to Shelley's "Dormouse"); Thomas Jefferson Hogg is "the pensive hedgehog" and "a second Bacon"; Leigh Hunt is "La Caccia" whilst Thomas Love Peacock is "the Pagan" and--for Mary Shelley specifically--"Greeky Peaky.
The non infectious granulomas are non caseating nacked sarcoid granulomas of unknown etiology with numerous activated macrophages, few lymphocytes and scattered asteroid body or conchoids body.