## Etymology
From Middle English addre, from Old English nǣdre ('snake'), from Proto-Germanic *nēdrǭ; the initial n was lost through misdivision of 'a nadder' as 'an adder'. From the Proto-Indo-European root *(s)neh₁- ('to spin, twist').

## AI Etymology
Adder is a noun meaning "a small venomous snake of the viper family". Historically, it is from Middle English addre, from Old English nǣdre ('snake'), from Proto-Germanic *nēdrǭ; the initial n was lost through misdivision of 'a nadder' as 'an adder'. From the Proto-Indo-European root *(s)neh₁- ('to spin, twist'). The historical chain links Old English nǣdre with Proto-Germanic *nēdrǭ. This keeps the modern noun sense tied to the older forms and language sequence behind it.

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