lóksos
“salmon, trout”salmon
PIE word for salmon or trout. Gives German Lachs, Lithuanian lašišà, Tocharian laks.
Discussion
The Proto-Indo-European word *lóksos is reconstructed with the meaning "salmon" or "trout" and holds a special place in Indo-European studies because of its role in the so-called Salmon Problem — the debate over the original homeland of the Proto-Indo-Europeans. The argument runs that if the proto-language had a word for salmon, the speakers must have lived in a region where salmon were found, which would favour a northern European homeland over the steppe hypothesis favoured by most modern scholars.
The most direct reflexes appear in Germanic and Baltic. Old English leax "salmon" survived into Middle English but was eventually displaced by the French-derived salmon. However, the word persists in modern English as lox, borrowed from Yiddish laks, itself from Middle High German lahs "salmon". This makes lox one of the few everyday English words that can be traced back to a Proto-Indo-European animal term through a Yiddish intermediary. German Lachs "salmon" is the direct Germanic cognate.
In Baltic, Lithuanian lašiša "salmon" and Latvian lasis "salmon" preserve the root with high fidelity. The Slavic branch also shows traces, though the evidence is debated. Some scholars connect the Ossetic (Iranian) word for a type of fish as well, though this is less certain.
The Salmon Problem remains unresolved. Critics of the argument note that *lóksos may originally have denoted any large river fish — trout, salmon, or similar — and that its meaning could have shifted as speakers migrated. The word may tell us less about geography than about the importance of freshwater fish in the Proto-Indo-European diet. Regardless of the homeland debate, *lóksos remains a vivid window into the natural world of the proto-language speakers and a reminder that even a single word can shape scholarly arguments about prehistory.
Notes
Key word for IE homeland debates — salmon distribution limits geography
Related Roots
English Words from *lóksos
These modern English words descend from this root. Each page traces the full journey from PIE to present-day English.