conchoid

noun

con·​choid

ˈkäŋˌkȯid,

ˈkänˌ- also ˈkȯŋˌ-

plural -s

1

: a plane curve determined as the collection of pairs of points located on converging rays crossing a fixed line or curve from which each point of the pair is equidistant, measured along a ray

2

: bulb of percussion

Word History

Etymology

Greek konchoeidēs, literally, conchlike, from konch- conch- + -oeidēs -oid

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