trilobite

noun
tri·​lo·​bite | \ ˈtrī-lə-ˌbīt How to pronounce trilobite (audio) \

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

Illustration of trilobite

Illustration of trilobite

trilobite fossil

Examples of trilobite in a Sentence

Recent Examples on the Web This particular trilobite could see about 200 facets or pixels. Ashley Strickland, CNN, "This 429 million-year-old trilobite eye is similar to those of modern insects," 13 Aug. 2020 The eye’s anatomy indicates the trilobite lived in a bright, shallow-water environment. Riley Black, Scientific American, "A 429-Million-Year-Old Trilobite Had Eyes like Those of Modern Bees," 13 Aug. 2020 It’s a centimeter-long trilobite called Aulacopleura koninckii that split in half as the rock layer was peeled apart. Scott K. Johnson, Ars Technica, "Fabulous fossil preserves eyes of 429-million-year-old trilobite," 15 Aug. 2020 And the eye told scientists something else about the trilobite in general. Ashley Strickland, CNN, "This 429 million-year-old trilobite eye is similar to those of modern insects," 13 Aug. 2020 In the case of one particular 429-million-year-old trilobite—an extinct arthropod that looked like a big version of a wood louse—a crack in just the right place has allowed paleontologists to see the world through the creature’s eyes. Riley Black, Scientific American, "A 429-Million-Year-Old Trilobite Had Eyes like Those of Modern Bees," 13 Aug. 2020 The trilobite’s eye is very different from our own, Schoenemann notes, because it is made up of dozens of facets that would have created a mosaic image of the creature’s environment. Riley Black, Scientific American, "A 429-Million-Year-Old Trilobite Had Eyes like Those of Modern Bees," 13 Aug. 2020 This is the first time researchers have been able to describe a trilobite that was translucent. Ashley Strickland, CNN, "This 429 million-year-old trilobite eye is similar to those of modern insects," 13 Aug. 2020 The event took its hardest toll on marine organisms such as corals, shelled brachiopods, eel-like creatures called conodonts, and the trilobites. Michael Greshko, National Geographic, "What are mass extinctions, and what causes them?," 30 Sep. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'trilobite.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of trilobite

1832, in the meaning defined above

History and Etymology for trilobite

borrowed from German Trilobit, from New Latin trilobus "three-lobed" (borrowed from Greek trílobos, from tri- tri- + -lobos, adjective derivative of lobós lobe) + German -it -ite entry 1

Note: German Trilobit was introduced by the theologian and naturalist Johann Ernst Immanuel Walch (1725-78) in Die Naturgeschichte der Versteinerungen zur Erläuterung der Knorrischen Sammlung von Merkwürdigkeiten der Natur ("The Natural History of Fossils, as a Commentary on the Knorr Collection of the Curiosities of Nature"), 3. Theil (Nuremberg, 1771) p. 120 and following. This work, in four parts issued from 1768 to 1773, was an expanded and greatly improved edition of a publication begun by the Nuremberg engraver and fossil collector Georg Wolfgang Knorr, who had died in 1761. According to Walch, "Da man dieses Petrefact Anfangs nur Stückweise entdeckte, und nicht wusste, zu was vor einer Gattung von Körpern man dasselbe rechnen sollte, so hielte sich fast jeder Naturforscher, der dasselbe bekannt machte, für berechtiget, ihm einen eigenen Nahmen beyzulegen…[there follows a discussion of various names, as concha trílobos [latter word in Greek letters], concha triloba rugosa, pectunculites trilobus, entomolithus paradoxus, Dudley fossil, etc.]…Alle aber, zusammen genommen, sind ihm gegeben worden, entweder von seiner Gestalt und Aenlichkeit, die es mit andern Körpern hat, oder von dem vermeintlichen Original, so man, wiewohl meist ohne Grund, dafür angesehen, oder von dem Ort und Gegend, wo man dasselbe gefunden. Wir wollen ihm die allersimpelste Benennung beylegen, und es einen Trilobiten nennen" ("Since early on only fragments of the fossil had been discovered, and no one knew the category of body under which it should be considered, almost every investigator of nature who made it known felt justified in conferring on it his own name…Taken together, all these names have been given either from its shape and similarity to other bodies, or from what is regarded, usually without any basis, as the presumed prototype, or from the place where it was found. We want to confer on it the simplest name possible, and call it a trilobite"). (Walch uses Trilobit as a weak noun, with an accusative singular Trilobiten.) Walch's Naturgeschichte der Versteinerungen was translated into Dutch (3rd Part, 1773) and French (3rd Part, 1775), with the animal designated respectively as Trilobiet and Trilobite in these languages. Further details about Walch, as well as an English translation of the French version of relevant passages from Naturgeschichte der Versteinerungen, can be found in Robert Kihm and James St. John, "Walch's Trilobite Research—A Translation of His 1771 Trilobite Chapter," Fabulous Fossils—300 Years of Worldwide Research on Trilobites, edited by D.G. Mikulic, et al., New York State Museum Bulletin 507 (Albany, 2007), pp. 115-40. Note that Walch only uses Trilobit as a vernacular designation; the class name Trilobita, though attributed to Walch in taxonomic literature, does not appear in the book.

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The first known use of trilobite was in 1832

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Last Updated

6 Oct 2020

Cite this Entry

“Trilobite.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/trilobite. Accessed 20 Oct. 2020.

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Britannica.com: Encyclopedia article about trilobite

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