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

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now