‖Hy′po‐rha″chis (?), n.; pl.Hyporhachides (#). [NL., fr. Gr. υπὅ beneath + � spine.] (Zoöl.) The stem of an aftershaft or hypoptilum. [Written also hyporachis.]
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.