Definition of trilobite
: any of numerous extinct Paleozoic marine arthropods (group Trilobita) having the segments of the body divided by furrows on the dorsal surface into three lobes
Origin of trilobite
ultimately from Greek trilobos three-lobed, from tri- + lobos lobe
First Known Use: 1832
Learn More about trilobite
Britannica.com: Encyclopedia article about "trilobite"
Seen and Heard
What made you want to look up trilobite? Please tell us where you read or heard it (including the quote, if possible).