1. a flexible rod-like structure that forms the supporting axis of the body in the lowest chordates and in the embryos of higher vertebrates
Usage: biology

Examples

• The notochord is present in all chordate embryos during early development.
• In vertebrates, the notochord is eventually replaced by the vertebral column.
• Amphioxus retains its notochord throughout its adult life.
• The notochord provides structural support and helps organize the developing nervous system.
• Scientists study the notochord to understand vertebrate evolution.
• The formation of the notochord is one of the earliest events in chordate development.