Home › Words › T › trilobitetrilobite/ˈtɹaɪ.ləˌbaɪt/trilobite means an extinct arthropod of the class Trilobita, whose body had three large lobes.trilobite is pronounced /ˈtɹaɪ.ləˌbaɪt/.EtymologyBorrowed from translingual Trilobita. By surface analysis, tri- (“three”) + lobe + -ite (“mineral, individual”), literally “three-lober”.nounAn extinct arthropod of the class Trilobita, whose body had three large lobes.e.g.“When you look at a Precambrian trilobite in the lobby of a New York bank, it is difficult to speculate about its primeval environment.” — 1981, William Irwin Thompson, The Time Falling Bodies Take to Light: Mythology, Sexuality and the Origins of Culture, London: Rider/Hutchinson & Co., page 209:Definitions & examples from Wiktionary (CC BY-SA 3.0).