Where does “hisseth” come from?

hisseth (English) comes from English hiss, from Middle English hissen.

hisseth (English): third-person singular simple present indicative...

Definitions

  1. third-person singular simple present indicative...

Ancestry of “hisseth”, step by step

hisseth traces back through two separate lines of ancestry.

via English hiss

StepLanguageWordMeaning
1EnglishhissA sibilant sound, such as that made by a snake or...
2Middle Englishhissen

via English eth

StepLanguageWordMeaning
1EnglishethA letter introduced into Old English to...
Every word from Middle English hissenEvery word from English hiss