Pronunciation: ' no ̇ -t ə - ˌ lo ̇ id, ' nä-
Function: noun
Date: circa 1728
: any of a subclass (Nautiloidea) of cephalopods bearing an external straight, curved, or spiral shell that were abundant chiefly in the Paleozoic but are represented in the recent fauna only by the nautiluses
– nautiloid adjective