ῥαχιστήρ

οῦ, ῆρος, ὁ
A. he who cuts the victim through the spine, Phot.
II. boaster, braggart, Theopomp.Com. 43: also ῥαχιστήρ, ῆρος, ὁ, Hsch.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project