Trilobite

Trilobites (t, t; meaning `three lobes`) are a well-known fossil group of extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the Early Cambrian period ({ma|Atdabanian}), and the.....
Found on http://en.wikipedia.org/wiki/Trilobite

Trilobite

• (n.) Any one of numerous species of extinct arthropods belonging to the order Trilobita. Trilobites were very common in the Silurian and Devonian periods, but became extinct at the close of the Paleozoic. So named from the three lobes usually seen on each segment.
Found on http://thinkexist.com/dictionary/meaning/trilobite/

trilobite

<paleontology> Any one of numerous species of extinct arthropods belonging to the order Trilobita. Trilobites were very common in the Silurian and Devonian periods, but became extinct at the close of the Paleozoic. So named from the three lobes usually seen on each segment. ... Origin: Cf. F. Trilobite. See Trilobate. ... Source: Websters Dic...
Found on http://www.encyclo.co.uk/local/20973

Trilobite

(pronounced TRI-low-bite) Trilobites were early invertebrates with a segmented body and an exoskeleton. Trilobites dominated the environment during the Cambrian Period (540 to 500 mya).
Found on http://www.enchantedlearning.com/subjects/dinosaurs/glossary/

trilobite

noun an extinct arthropod that was abundant in Paleozoic times; had an exoskeleton divided into three parts
Found on https://www.encyclo.co.uk/local/20974

trilobite

any member of a group of extinct fossil arthropods easily recognized by their distinctive three-lobed, three-segmented form. Trilobites, exclusively ... [10 related articles]
Found on http://www.britannica.com/eb/a-z/t/80

trilobite

Any of a large class (Trilobita) of extinct, marine, invertebrate arthropods of the Palaeozoic era, with a flattened, oval body, 1–65 cm/0.4–26 in long. The hard-shelled body was divided by two deep furrows into three lobes. Some were burrowers, others were swimming and floating forms. Their worldwide distribution, many species, a...
Found on http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0008737.html

trilobite

extinct, marine arthropods; trilobites had jointed legs and a body divided into three vertical lobes and several horizontal segments
Found on http://insectzoo.msstate.edu/Glossary/

Trilobite

member of an extinct group of marine arthropods characterised by three body sections and bearing a superficial resemblance to a woodlouse. First appeared in the Cambrian and became extinct in the Permian
Found on http://www.sedgwickmuseum.org/education/glossary.html

Trilobite

The term trilobite is applied to any one of numerous extinct marine arthropods that resembled large woodlice and belonged to the subphylum Trilobita. The trilobites had a jointed horny body divided into three section - hence their name - an anterior solid cephalon, a segmented thorax or trunk, and a posterior pygidium. The fossil remains of trilobi...
Found on http://www.probertencyclopaedia.com/browse/BT.HTM

trilobite

trilobite (trī'lubīt") , subphylum of the phylum Arthropoda that includes a large group of extinct marine animals that were abundant in the Paleozoic era. They represent more than half of the known fossils from the Cambrian period. The trilobite body was generally oval and flat a...
Found on http://www.infoplease.com/ce6/sci/A0849422.html

trilobite

[n] - an extinct arthropod that was abundant in Palaeozoic times
Found on http://www.webdictionary.co.uk/definition.php?query=trilobite
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