helicoid

adjective

he·​li·​coid ˈhe-lə-ˌkȯid  ˈhē- 

variants or helicoidal

ˌhe-lə-ˈkȯi-dᵊl  ˌhē- 

1

: forming or arranged in a spiral

2

: having the form of a flat coil or flattened spiral

helicoid snail shell

Word History

First Known Use

circa 1704, in the meaning defined at sense 1

Medical Definition

helicoid

adjective

he·​li·​coid ˈhel-ə-ˌkȯid  ˈhē-lə- 

variants or helicoidal

ˌhel-ə-ˈkȯid-ᵊl  ˌhē-lə- 

1

: forming or arranged in a spiral

2

: having the form of a flat coil or flattened spiral