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Webster 1913 Edition

Noun.

[Corrupted fr.

caliber

An early form of hand gun, a variety of the arquebus; originally a gun having a regular size of bore.

[Obs.]

Shak.

Noun.

[from caliber.] A kind of handgun, musket or arquebuse.

caliver ‎(plural calivers)

(historical) A type of light musket.
- 1603, John Florio, translating Michel de Montaigne, Essayes, London: Edward Blount, OCLC 946730821, II.3:
  That done, running out into the streets, with a crosse-bow in one hand, and a caliver [transl. harquebouze] in the other, at two shoots, slew the two first Turks that came next to his gates […].