The Collaborative International Dictionary
Hyporhachides
Hyporhachis \Hy`po*rha"chis\, n.; pl. Hyporhachides. [NL., fr. Gr. "ypo` beneath + ? spine.] (Zo["o]l.) The stem of an aftershaft or hypoptilum. [Written also hyporachis.]
Wiktionary
hyporhachides
n. (plural of hyporhachis English)