Third-person singular simple present indicative form of cannonball.(verb)
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Use "cannonballs" in a sentence
"The rest were weak, although The Next Doctor did have a 400-foot-tall Cyberman shooting up Victorian London with auto-firing cannonballs, which is kind of cool."
"We'd been calling the cannonballs 'gray peas,' but the thing that shot low across the deck, tearing rail, cannon ports, and people apart in a shower of wooden splinters, was no pea. . ."
"The remaining artifacts include Revolutionary War items such as cannonballs, militia uniforms and Continental Congress-era currency."