adder

card 1 of 10 · context meaning

What does 'adder' mean in this sentence?

CALIBAN: His spirits hear me, / And yet I needs must curse. But they'll nor pinch / Fright me with urchin-shows, pitch me i'th' mire, / Nor lead me like a firebrand in the dark / Out of my way, unless he bid 'em; but / For every trifle are they set upon me, / Sometimes like apes that mow and chatter at me, / And after bite me; then like hedgehogs, which / Lie tumbling in my barefoot way, and mount / Their pricks at my footfall; sometimes am I / All wound with adders, who with their cloven tongues / Do hiss me into madness—