the GNU version of the Collaborative International Dictionary of English
n. An early form of hand gun, a variety of the arquebus; originally a gun having a regular size of bore.
The Century Dictionary and Cyclopedia
n. In the sixteenth century, a hand-firearm lighter than the musket and fired without a rest; especially, such a gun when of fixed diameter or caliber for a whole company of soldiers using the same ammunition. Also spelled calliver.
Word Usage
"Which most discourteous act seemed at first likely to be somewhat heavily avenged on Amyas; for as he spoke, a couple of caliver-shots, fired from under the poop, passed “ping” “ping” by his ears, and Cary clapped his hand to his side."