adder

n. poisonous snake(It was an ancient super-stition that adders were deaf.) 毒蛇（古代迷信为耳聋）。
△2H.VI. 3.2.76:“What? Art thou,like the adder,waxen deaf?”怎么？ 难道你像毒蛇一样，变聋了吗？
△Ham.3. 4. 203:“Whom I will trust as I will addersfanged，”i.e. poisonous snakes with fangs. 对他们我只能当做有牙的毒蛇那样信任。

a lurking adder

adder宽蛇(Viperidae)

蝰蛇科的几种毒蛇和眼镜蛇科的棘蛇的统称。尤指龙纹蝰(Vipera berus)。遍布欧亚大陆。体粗壮，长达80厘米，灰黑色，背部有“之”字形黑色条纹，两侧有黑色斑块。棘蛇(Acanthophis antarcticus)产于澳大利亚，形似蝰蛇，毒性强烈。