noun
- flexible rod-like structures that form the primitive backbone in embryos of vertebrates and persist as the main skeletal support in some primitive chordates
Usage: biology; anatomy
Examples
- The notochords develop early in vertebrate embryos.
- In humans, notochords are eventually replaced by the vertebral column.
- Amphioxus retains its notochord throughout its adult life.
- The notochords provide structural support during early development.
- Scientists study notochords to understand vertebrate evolution.
- Hagfish have notochords but lack true vertebrae.