rachis

play
noun ra·chis \ˈrā-kəs, ˈra-\

Definition of rachis

plural

rachises

also

rachides

play \ˈra-kə-ˌdēz, ˈrā-\
  1. 1 :  an axial structure: such asa (1) :  the elongated axis of an inflorescence (2) :  an extension of the petiole of a compound leaf that bears the leafletsb :  the distal part of the shaft of a feather that bears the web

  2. 2 :  spinal column

Origin and Etymology of rachis

New Latin rachid-, rachis, from Greek rhachis; akin to Greek rhachos thorn, Lithuanian ražas dry twig, tine


First Known Use: 1785

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