1. a sea animal with a soft body and a spiral shell that lives in the ocean
Usage: marine biology
2. a type of exercise machine with weights and pulleys used for strength training
Usage: fitness equipment

Examples

• The nautilus uses jet propulsion to move through the water.
• Scientists study the nautilus to understand ancient marine life.
• The nautilus shell has beautiful spiral chambers inside.
• She worked out on the nautilus machine at the gym.
• The fitness center has several nautilus machines for different muscle groups.
• A nautilus can withdraw completely into its shell for protection.