WordReference Random House Unabridged Dictionary of American English © 2026
con•choid
(kong′koid),USA pronunciation n. [Geom.]
- a plane curve such that if a straight line is drawn from a certain fixed point, called the pole of the curve, to the curve, the part of the line intersected between the curve and its asymptote is always equal to a fixed distance. Equation:r= b ± a sec θ.
- Greek konchoeidé̄s. See conch, -oid
- 1790–1800
'conchoid' also found in these entries (note: many are not synonyms or translations):