Definitions:

1. In botany context, is the main stalk or central axis of a compund leaf, inflorescence or flower cluster, or fern frond, from which leaflets, flowers, or smaller branches grow. NOUN
   • Each leaflet is attached to the rachis of the compound leaf.
2. In zoology context, is the central shaft of a feather, from which the barbs or soft filaments extend. NOUN
   • The feather's rachis provides structure and supports the vanes.
3. Term used primarily in botany and zoology to describe a main axis or stem from which smaller parts grow or branch. NOUN
   • The rachis of the fern frond curved gently as the leaflets unfurled.

Synonyms:

• shaft
• Spine
• stalk

NearBy Words:

• rachischisis