Answer: rachis

AnswerCrossword Clue
RACHISThe spine: Anat.
RACHISSpinal column
rachisa. the axis of an inflorescence when somewhat elongated, as in a raceme b. (in a pinnately compound leaf or frond) the prolongation of the petiole along which the leaflets are disposed c. any of various axial structures
rachisthe part of the shaft of a feather bearing the web
rachisextension of the petiole of a compound leaf that bears the leaflets
rachisthe spinal column, also RHACHIS
rachisan axial structure as