(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.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). trilobite. Retrieved September 25, 2026, from http://smartdefine.org/trilobite/definitions/2074717 |
| Chicago | Webster's. 2011. "trilobite" http://smartdefine.org/trilobite/definitions/2074717 (accessed September 25, 2026). |
| Harvard | Webster's 2011, trilobite, Smart Define, viewed 25 September, 2026, <http://smartdefine.org/trilobite/definitions/2074717>. |
| MLA | Webster's. "trilobite" 28 May 2011. Web. 25 September 2026. <http://smartdefine.org/trilobite/definitions/2074717> |