Definition of trilobite noun from the Oxford Advanced Learner's Dictionary

 

trilobite

 noun
noun
BrE BrE//ˈtraɪləʊbaɪt//
 
; NAmE NAmE//ˈtraɪləbaɪt//
 
 
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a small sea creature that lived millions of years ago and is now a fossil Word Origin mid 19th cent.: from modern Latin Trilobites, from Greek tri- ‘three’ + lobos ‘lobe’.
See the Oxford Advanced American Dictionary entry: trilobite