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The Collaborative International Dictionary
Rachitome

Rachitome \Ra"chi*tome\ (r[=a]"k[i^]*t[=o]m), n. [F., fr. Gr. "ra`chis, -ios, the spine + te`mnein to cut.] A dissecting instrument for opening the spinal canal.

Wiktionary
rachitome

n. A dissecting instrument for opening the spinal canal.