Main Entry: he·li·coid

Pronunciation: \ˈhel-ə-ˌkȯid, ˈhē-lə-\

Variant(s): or he·li·coi·dal \ˌhel-ə-ˈkȯid-^əl, ˌhē-lə-\

Function: adjective

1 : forming or arranged in a spiral
2 : having the form of a flat coil or flattened spiral