释义
n.
a small venomous Eurasian snake which has a dark zigzag pattern on its back and bears live young. It is the only poisonous snake in Britain.
极北蝰。亦称VIPER.
used in names of similar or related snakes, e.g. death adder, puff adder
[用 于类似或相关蛇类名称中,如death adder, puff adder] 。
n.
Electronics a unit which adds together two input variables. A full adder can add a bit carried from another addition as well as the two inputs, whereas a half adder can only add the inputs together.
【电子】 加法器。
词源
"Old English nædre ‘serpent, adder', of Germanic origin; related to Dutch adder and German Natter. The initial n was lost in Middle English by wrong division of a naddre; compare with APRON, AUGER, and UMPIRE."