adder or other poisonous snake

: ; metaph., , , .† a viper Ac 28:3 Mt 3:7 12:34 23:33 Lk 3:7 γεννήματα ἐχιδνῶν

adder

a serpent, snake, viper.

snake

an adder or other poisonous snake (literally or figuratively)

viper

ἔχιδνα, -ης, ἡ [in OT (Aq.), Isa.59:5 * ;] a viper: Act.28:3; metaphorically, γεννήματα ἐχιδνῶν, Mat.3:7 12:34 23:33, Luk.3:7.† (AS)