Rachis

For other uses, see Rachis (disambiguation).
The dark rachis of a wild turkey feather

In biology, a rachis /ˈreɪkɪs/ (from the Ancient Greek: ῥάχις [rhákhis], "backbone, spine")[1] is a main axis or "shaft".

  1. ^ Henry George Liddell, Robert Scott, A Greek–English Lexicon, ράχις