sawback

Noun

 * 1)  A back (dorsal, spinal, or spinelike aspect) that is a saw or is sawlike in form, as:
 * 2) A ridge or mountain range whose silhouette is suggestive of sawteeth.
 * 3) A knife, often a machete, whose spine has sawteeth.
 * 1) A knife, often a machete, whose spine has sawteeth.