1. (noun) rachis
axis of a compound leaf or compound inflorescence
Synonyms: vertebral column, back, spine, backbone, spinal column
2. (noun) spinal column, vertebral column, spine, backbone, back, rachis
the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
Synonyms: dorsum, cover, sticker, spikelet, mainstay, backrest, lynchpin, binding, grit, prickle, book binding, pricker, spine, sand, thorn, spinal column, keystone, spur, linchpin, back, backbone, rear, acantha, gumption, anchor, rachis, moxie, guts, vertebral column
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Synonyms for rachis 
