nautilus

• Nom désignant un mollusque céphalopode marin à coquille spiralée vivant dans les mers chaudes, ou un type de sous-marin nucléaire.

A noun referring to a marine cephalopod mollusk with a spiral shell, found in warm seas, or to a type of nuclear-powered submarine.

1. Nuclear-powered submarineB2formal

   A type of submarine that is propelled by nuclear power, capable of long-range underwater travel.

   Sous-marin nucléaire d'attaque

   • The Nautilus was the first nuclear-powered submarine in history.
   • The crew embarked on a mission aboard the nuclear submarine.
   • Modern navies operate nuclear submarines for strategic defense.

2. Paper nautilus (Argonauta)C1formalscientific

   A cephalopod mollusk of warm seas whose females have a delicate, papery spiral shell used for buoyancy and brooding eggs.

   Argonauta (papier nautile)

   • The paper nautilus is known for its fragile, translucent shell.
   • Female argonauts produce a papery shell that is not attached to their body.
   • Marine biologists study the paper nautilus for its unique reproductive behavior.

   Synonymespaper nautilus

3. Chambered nautilus (Nautilus)C1formalscientific

   A cephalopod of the Indian and Pacific oceans having a spiral shell with pale pearly partitions, known for its buoyancy control.

   Nautile

   • The chambered nautilus uses gas-filled chambers in its shell to control buoyancy.
   • Its spiral shell is prized for its pearly interior.
   • Nautiluses are considered living fossils, unchanged for millions of years.

   Synonymeschambered nautiluspearly nautilus