Definition
Something 'chitinous' is made of or resembles chitin, a tough, semitransparent substance that is the main component of the exoskeletons of arthropods, such as insects and crustaceans. Think of it as the biological equivalent of armor plating for bugs and crabs. It provides structural support and protection. This term is primarily used in biology and zoology. Unlike soft tissues, it is rigid and durable. A chitinous exoskeleton allows for movement and defense.