chain mail (armor, armour)
sickle and chain (weapon)
viper (esp. a pitless viper)
human chain (chain of people holding hands, usually in protest)
even the strong-willed fall into temptation; there's nothing you can't do if you set your mind to it
chained library; library where the books are attached to their bookcase with a chain
rain chain (hanging from a gutter and functioning as downspout, often made of ornamental cups)
cerastes; horned viper; horned adder
European adder (Vipera berus)
Russell's viper (Daboia russelii)