rachides is rachis's Plural Form

rachis

US 
UK 
  • n.【解】脊椎;【植】花序轴;【动】羽轴;分脊
  • Web花轴
Plural Form:rachises  Plural Form:rachides  
n.
1.
【解】脊椎,脊柱;【植】花序轴,叶轴;【动】羽轴;分脊