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Medical Definition of Haematorrhachis
1. A spinal haemorrhage. Synonym: haemorrhachis. Origin: haemato-+ G. Rhachis, spine Haematorrhachis externa, haemorrhage into the spinal canal external to the cord, either within or outside the dura. Synonym: extradural haematorrhachis, subdural haematorrhachis. (05 Mar 2000)