Noun
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.
Source: Webster's dictionaryThe eye of the trilobite tells us that the sun shone on the old beach where he lived; for there is nothing in nature without a purpose, and when so complicated an organ was made to receive light, there must have been light to enter it. Louis Agassiz
The government sends paleontologist Kyohei Yamane to lead an investigation to the island, where giant radioactive footprints and a trilobite are discovered. Source: Internet
Now he's a trilobite. Source: Internet
The late Ordovician species of trilobite that spent some of its life in the plankton layer near the ocean surface was much harder hit than deep-water dwellers, which tended to remain within quite restricted areas. Source: Internet