RHACHIS
\ɹˈat͡ʃa͡ɪz], \ɹˈatʃaɪz], \ɹ_ˈa_tʃ_aɪ_z]\
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The spine.
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The shaft of a feather. The rhachis of the after-shaft, or plumule, is called the hyporhachis.
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The central cord in the stem of a crinoid.
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The median part of the radula of a mollusk.
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A central cord of the ovary of nematodes.
By Oddity Software