Meaning & use
nautilus
Last updated
A marine mollusk with a spiral, chambered shell, found chiefly in the Indo-Pacific Ocean.
See it in a sentence
A chambered nautilus drifted slowly past the reef, its shell glinting in the sunlight.
The nautilus propels itself by expelling water through a funnel-like siphon.
A note on using this word
The nautilus is often called a "living fossil" because its basic body plan has changed little in hundreds of millions of years.
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