conus

noun

co·​nus ˈkō-nəs 

1

capitalized : a very large genus (the type of the family Conidae) of tropical marine snails comprising the cones and including many harmless forms and a few chiefly in the southwest Pacific that are highly dangerous because they are capable of biting with the radula and injecting a paralytic venom that has been known to cause death in humans

2

plural coni -ˌnī, -(ˌ)nē  : conus arteriosus