A super-worthless word. An eponymic taxonomic descriptive of a breed of tropical fish!
From M-W online dictionary:

One entry found for helleri.



Main Entry: hel·leri
Pronunciation: 'he-l&-"rI, -(")rE
Function: noun
Inflected Form(s): plural -ler·ies
Etymology: New Latin (specific epithet of Xiphophorus helleri), from
C. Heller, 20th century tropical fish collector
Date: 1931
1 : SWORDTAIL
2 : any of various brightly colored aquarium fishes developed by
hybridization of swordtails and platys