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X-acto knife Syllabification: X-act·o knife
Pronunciation: /iɡˈzaktō ˌnīf/

Definition of X-acto knife in English:


North American trademark
A utility knife with a very sharp replaceable blade.
Example sentences
  • I'm guessing it should be possible to disable the serial number by cutting the CLK line to the EEPROM, which should be easy for anyone with a keen eye and a sharp X-acto knife.
  • Use an X-acto knife to cut an X in the center opening, and fold excess fabric into the back of the plate.
  • On the first one he drew the uppermost layer of a crack and cut it out with an X-acto knife.


1940s: respelling of the adjective exact + -o.

Definition of X-acto knife in:
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