Term Name:	feather rachis
Synonyms:	feather shaft, main shaft of feather, rachis, rachis of feather
Definition:	The long solid, tubular extension of the calamus above the skin. The rachis contains pith, which is composed of air-filled keratinised epithelial cells surrounded by a solid keratinised outer cortex.
Ontology:	Uberon Ontology [UBERON:0008288]