Webster’s Revised Unabridged Dictionary · 1913
Hyporhachis
Hy′po·rha′chis (·rā′kĭs), n.; pl. Hyporhachides (#). [NL., fr. Gr. ὑπό beneath + ῥάχις spine.] (Zoöl.) The stem of an aftershaft or hypoptilum. [Written also hyporachis.]
Webster’s Revised Unabridged Dictionary · 1913
Hy′po·rha′chis (·rā′kĭs), n.; pl. Hyporhachides (#). [NL., fr. Gr. ὑπό beneath + ῥάχις spine.] (Zoöl.) The stem of an aftershaft or hypoptilum. [Written also hyporachis.]