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Definition of rachis: 1. Same as Rhachis.
2. The spine; the vertebral column.

Synonyms:

backbone, thorn, dorsum, gumption, cover, lynchpin, book binding, anchor, backrest, spine, mainstay, keystone, spur, sand, prickle, linchpin, spikelet, pricker, sticker, acantha, moxie, vertebral column, rear, spinal column, guts, binding, grit, back

See how do you define rachis. See rachis definition.