Adder
An adder is a name for the common viper (Vipera cevus), ranging from Wales to Saghalien island, and from Caithness to the north of Spain as well Australia and most parts of Africa. The Puff Adder and Death Adder are highly venomous and bites can be fatal to humans. The single bite of an adult Death Adder can kill up to three humans.
| Common Name | Technical Name | Geographic Range |
|---|---|---|
| Death Adder | Acanthopbis antarcticus | Australia, New Guinea |
| Dwarf Sand Adder | Bitis peringueyi | Namibia, Angola |
| Horned Adder | Bitis caudalis | South Africa, Zimbabwe, Angola, Namibia |
| Many-Horned Adder | Bitis cornuta cornuta | Namibia, South Africa |
| Namaqua Dwarf Adder | Bitis schneideri | SW South Africa |
| Mountain Adder | Bitis atropos atropos | Zimbabwe, South Africa |
| Puff Adder | Bitis arietans arietans | Africa, Yemen |
| Rhombic Night Adder | Causus rhombeatus | Africa |
Etymology: The word was in Old Eng. noedre, later nadder or naddre; in the 14th century a nadder was, like a napron, wrongly divided into an adder. It appears with the generic meaning of serpent in the older forms of many Teutonic languages, cf. Old High Ger. natra; Goth. nadrs. It is thus used in the Old English version of the Christian Scriptures for the devil, the serpent of Genesis.
Initial text from 1911 encyclopedia -- Please update as needed
In computing, an adder is an electronic device that adds three bits. One that adds only two bits is a half-adder.