Anlaut.

> Spontaneous change (fricative) /G/ <-> /w/ has been registered in
> anlaut, Russian gu'senitsa 'caterpillar (Standard Russian)':(v)
> u'senitsa 'the same (dialects) < Gusenitsa:wusenica < (Proto Slavic)
> *o,senica with protetic /w/ being the most well-known example.
>
> Sergei

Ok. I know ablaut and umlaut. Now, in English terms, define anlaut.
Please.

English-term ablaut is the verb sing-sang-sung and the noun song.

English-term umlaut is foot-feet, and High German fuss/fuess.

What's anlaut?