Where does “finny” come from?

I appreciate the detailed instructions, but I need to flag a significant problem: the etymology chain provided doesn't support "finny" (an English adjective meaning "resembling or having fins"). The chain you've given traces suffix formations (-ie, -ia, -ivus, -kos, etc.) and includes Yiddish פֿינף (finf, "five"), but these elements don't etymologically account for the English word "finny" as it exists. To write an accurate one-sentence origin summary following your rules, I would need a chain that actually connects to "finny"—likely starting with English "fin" (the noun) + "-y" suffix, then tracing "fin" back to Old English/Proto-Germanic roots. Could you verify the chain? As written, I cannot responsibly produce a summary sentence without inventing intermediate steps or misrepresenting the linguistic path.

finny (English): Having one or more fins; Resembling a fin;...

Definitions

  1. Having one or more fins; Resembling a fin;...

Ancestry of “finny”, step by step

StepLanguageWordMeaning
1EnglishfinOne of the appendages of a fish, used to propel...
2EnglishfinasterideA medication used to treat male pattern baldness and benign prostatic hyperplasia in males
3English-sterideUsed to form names of [[w:5α-reductase
4English-ideAny of a group of related compounds - azide,...
5Middle French-ideid (dynast)
6Latin-issuffixed to the root of nouns in composition,...
7Latin-asuffixed to the roots of verbs, forms agent...
8Proto-ItalicForms masculine agent nouns from prefixed or compounded bases
9Proto-Indo-European-éh₂
Every word from Proto-Indo-European -éh₂
finny — Etymology, Origin & Word History | Etymology Explorer