conchoid
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Englannin sanakirja
conchoid englanniksi
puhekieltä Any of a family of curves defined as the locus of points p, such that each p is on a line that passes through a given fixed point P and intersects a given curve, C, and the distance from p to the point of intersection with C is a specified constant (note that for nontrivial cases two such points p satisfy the criteria, and the resultant curve has two parts).
The conchoid of a circle with respect to a point on the circle is a cardioid if the fixed distance is equal to the diameter of the circle.
The Conchoid of Nicomedes is the conchoid of a straight line with respect to a point not on the line.
1815, Charles Hutton, w:Pappus of Alexandria|Pappus, entry in A Philosophical and Mathematical Dictionary, Volume 2, http://books.google.com.au/books?id=lsdJAAAAMAAJ&pg=PA147&dq=%22conchoid%22%7C%22conchoids%22&hl=en&sa=X&ei=iUipU5mKNoTCkQXc9YCQDA&redir_esc=yv=onepage&q=%22conchoid%22%7C%22conchoids%22&f=false page 147,
1982, J. Lee Kavanau, Curves and Symmetry, Volume 1, http://books.google.com.au/books?id=bVfvAAAAMAAJ&q=%22conchoid%22%7C%22conchoids%22&dq=%22conchoid%22%7C%22conchoids%22&hl=en&sa=X&ei=iUipU5mKNoTCkQXc9YCQDA&redir_esc=y page 3,
2007, James Stewart, Single Variable Calculus, Volume 2, http://books.google.com.au/books?id=OTkUThhIdh4C&pg=PA662&dq=%22conchoids%22&hl=en&sa=X&ei=CVipU6X2IojRkwWe_4CgBQ&redir_esc=yv=onepage&q=%22conchoids%22&f=false page 662,
2009, Niccolò Guicciardini, Isaac Newton on Mathematical Certainty and Method, http://books.google.com.au/books?id=U4I82SJKqAIC&pg=PA68&dq=%22conchoid%22%7C%22conchoids%22&hl=en&sa=X&ei=iUipU5mKNoTCkQXc9YCQDA&redir_esc=yv=onepage&q=%22conchoid%22%7C%22conchoids%22&f=false page 68,
puhekieltä A conchoidal fracture in rock.
1948, Tennessee Valley Authority, The Hiwassee Valley Projects, Technical Report, Issue 5, Volume 2, http://books.google.com.au/books?id=gcs_AQAAIAAJ&q=%22conchoids%22&dq=%22conchoids%22&hl=en&sa=X&ei=CVipU6X2IojRkwWe_4CgBQ&redir_esc=y page 359,