Definition of "nautiloidea" [nautiloidea]

• A suborder or an order of tetrabranchiate cephalopoda, including those having shells with the suture-line simple or nearly so and the initial chamber conical and with a cicatrix.

The Century Dictionary (Public Domain)

• "Also most of them are semelparous that they lay eggs a lot at one time and die, but nautiloidea is exception."