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plural nautiluses or nautili
A marine mollusc, of the family Nautilidae native to the Pacific Ocean and Indian Ocean, which has tentacles and a spiral shell with a series of air-filled chambers, of which Nautilus is the type genus. quotations examples
He was still prepared to go on collecting all that life could offer, like a chambered nautilus patiently adding new cells to its slowly expanding spiral.
1956, Arthur C. Clarke, The City and the Stars, page 44
A kind of diving bell that sinks or rises by means of compressed air. examples