hyporhachis

== English == === Etymology === From hypo- (“beneath”) +‎ rhachis (“shaft of a feather”, variant of rachis). === Noun === hyporhachis (plural hyporhachides) (ornithology) The stem of an aftershaft. === References === “hyporhachis”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.