n.
Pronunciation: ' tr ī -l ə - ˌ b ī t
Function: noun
Etymology: ultimately from Greek trilobos three-lobed, from tri- + lobos lobe
Date: 1832
: 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
trilobite fossil