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The Collaborative International Dictionary of English v.0.48:

Hyporhachis \Hy`po*rha"chis\, n.; pl. Hyporhachides. [NL., fr.
   Gr. "ypo` beneath + ? spine.] (Zool.)
   The stem of an aftershaft or hypoptilum. [Written also
   hyporachis.]
   [1913 Webster]