In the manner of a conchoid; in a way that follows or describes the mathematical curve called a conchoid.
From conchoid (a type of curve) plus the adverbial suffix -ally. The underlying Greek term konkhē means shell, referencing the shell-like appearance of the curve.
A conchoid looks like it was drawn by a shell with a pen attached—the curve appears in nature in the way certain shells break, and mathematicians use it to describe patterns from seashell fractures to guitar soundholes.
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