nau·ti·loid (nôt l-oid )n. A mollusk of the subclass Nautiloidea, which includes the nautiluses and numerous extinct species known only from fossils. [From New Latin Nautilo  dea, subclass name : Latin nautilus, nautilus; see nautilus + Greek -oeid s, -oid.]nau ti·loid adj. |
| nautiloid (nôtl-oid) 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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