World English Dictionary
rachis or rhachis (ˈreɪkɪs)
n , pl rachises, rhachises, rachides, rhachides
1.  botany the main axis or stem of an inflorescence or compound leaf
2.  ornithol the shaft of a feather, esp the part that carries the barbs
3.  another name for spinal column
[C17: via New Latin from Greek rhakhis ridge]
rhachis or rhachis (ˈreɪkɪs, ˈrækɪˌdiːz, ˈreɪ-)
[C17: via New Latin from Greek rhakhis ridge]
rachial or rhachis
rhachial or rhachis
rachidial or rhachis
rhachidial or rhachis

Collins English Dictionary - Complete & Unabridged 10th Edition
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