nautiloid

American  

[nawt-l-oid] / ˈnɔt lˌɔɪd /

noun

1. a mollusk of the subclass Nautiloidea, including nautiluses and many fossil species that were abundant in the Ordovician and Silurian periods.

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adjective

1. noting or pertaining to a nautiloid.

nautiloid British  

/ ˈnɔːtɪˌlɔɪd /

noun

1. any mollusc of the Nautiloidea, a group of cephalopods that includes the pearly nautilus and many extinct forms

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adjective

1. of, relating to, or belonging to the Nautiloidea

nautiloid Scientific  

/ nôt′l-oid′ /

1. Any of various cephalopod mollusks of the subclass Nautiloidea, having a straight or coiled shell divided internally into a series of chambers of increasing size connected by a central tube. The nautiloids include the modern nautiluses as well as numerous extinct species dating back as far as the Cambrian Period.

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Etymology

Origin of nautiloid

First recorded in 1720–30; nautil(us) ( def. ) + -oid ( def. )

Example Sentences

Cephalic shield pointed behind; shell internal, chiefly membranous, with calcified nucleus, nautiloid; parapodia forming fins.

From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" by Various

Shell nautiloid, with simple sutures, siphuncle dorsal, that is, internal.

From Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" by Various

He referred also to the nautiloid shell of the larva falling to one side.

From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" by Various

Hastigerina only differs in the “flat” or nautiloid spiral.

From Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 1 "Gichtel, Johann" to "Glory" by Various

Globigerinidaceae.—Shells vitreous, coarsely perforated; chambers few spheroidal rapidly increasing in size; arranged in a trochoid or nautiloid spiral.

From Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 6 "Foraminifera" to "Fox, Edward" by Various