thagomizer (tha-goh-MEYE-zuhr) - n. (inf.) the collection of spikes on the end of the tail of stegasaurid dinosaurs.
Coined in 1982 by Gary Larson in a
The Far Side cartoon, and since adopted by many paleontologists, especially in informal contexts --
Wiktionary has a selection of citations. Ostensibly named after "the late Thag Simmons
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