Definitions

1. noun

A flexible, rod-like structure that provides axial stiffness and support in the embryonic stages of certain animals, typically disappearing in adulthood, found in chordates such as vertebrates, tunicates, and lancelets.

“During embryonic development, the notochord plays a crucial role in the formation of the vertebral column.”

2. noun

A key feature of the phylum Chordata, characterized by its ability to provide axial stiffness and support.

“The notochord is a defining characteristic of chordates, which includes vertebrates, tunicates, and lancelets.”