ˌ ̷ ̷ ̷ ̷ˈnȯd.ə noun
Usage: capitalized
Etymology: New Latin, from Latin, Argonaut
: a genus of cephalopods (order Dibranchia) including a single recent form, the paper nautilus ( A. argos ), related to the octopus and like it having eight arms two of which in the female are expanded at the tips to clasp the thin fragile unchambered shell — compare nautilus