1. plural of ichthyosaur; large extinct marine reptiles from the Mesozoic era that resembled dolphins or sharks
Usage: paleontology; plural form

Examples

• Ichthyosauruses were among the most successful marine predators of the Mesozoic era.
• The museum's fossil collection includes several well-preserved ichthyosauruses from the Jurassic period.
• Unlike dinosaurs, ichthyosauruses were fully adapted to life in the ocean.
• Scientists have discovered that ichthyosauruses gave birth to live young rather than laying eggs.
• The streamlined bodies of ichthyosauruses made them efficient swimmers.