1. the main axis or stem of a compound leaf or fern frond
Usage: botanical
2. the shaft of a feather
Usage: ornithological
3. the backbone or spinal column
Usage: anatomical

Examples

• The botanist examined the rachis of the compound leaf to identify the species.
• Each leaflet was attached to the central rachis of the fern frond.
• The bird’s feather had a strong rachis that supported the delicate barbs.
• Damage to the rachis can affect the entire feather’s structure.
• The vertebrae form the rachis that protects the spinal cord.
• In anatomy class, we studied how the rachis supports the body’s weight.