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plural trilobites
An extinct arthropod of the class Trilobita, whose body had three large lobes. quotations examples
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