Definition of "culverin"

Let Sacars, Culuerings, and Cannons ſound / In honour of their bones, and rock the ground / With all your deafning terrors: for behold / The Balſum for your wounds, are rich mens gold, / Powder the world with wonder, and thus crie, / The Camel now may paſſe the needles eie.

1616, M. Robert Anton, “The Philosophers fovrth Satyr of Mars”, in The Philosophers Satyrs, London: Printed by T[homas] C[reede] and B[ernard] A[lsop] for Roger Iackſon, page 36

This had been discharged from a culverin on the opposite side of the valley.

1895, R. D. Blackmore, Slain By The Doones, Dodd, Mead and Company, page 6