adj.
Pronunciation: ' he-l ə - ˌ ko ̇ id, ' h ē -
Variant: or he · li · coi · dal \ ˌ he-l ə - ' ko ̇ i-d ə l, ˌ h ē - \
Function: adjective
Date: circa 1704
1 : forming or arranged in a spiral
2 : having the form of a flat coil or flattened spiral < helicoid snail shell>