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Pachycephalosaurus

American  
[pak-i-sef-uh-luh-sawr-uhs] / ˌpæk ɪˌsɛf ə ləˈsɔr əs /

noun

  1. Paleontology. a genus of two-legged, herbivorous dinosaurs with distinctively thick, domed skulls edged with bony bumps and spikes.

  2. (pachycephalosaurus) a dinosaur of the genus Pachycephalosaurus.

pachycephalosaurus Scientific  
/ păk′ĭ-sĕf′ə-lə-sôr′əs /

  1. A large herbivorous dinosaur of the genus Pachycephalosaurus of the late Cretaceous Period. It grew to about 7.6 m (25 ft) long and had a domed skull up to 25.4 cm (10 inches) thick that was lined with small bumps and spikes. The thick skull may have been used for head-butting during mating displays.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.