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Definition of head and taillight tetra
head and taillight tetra
Plural:head and taillight tetras
head and taillight tetra Lexical Profile
CEFR
C1
Grade
9
Tier
3
Usage
Rare
• noun
1
A small, peaceful freshwater fish (Hemigrammus ocellifer) native to rivers in South America, popular in the aquarium trade and recognized by the brightly reflective, light-like spots above its eyes and at the base of its tail.
Example
"The hobbyist decided to add a school of head and taillight tetras to the planted community aquarium."
Word Origin & Etymology
Named for the distinct iridescent, copper-to-gold spots located above its eyes and at the base of its caudal fin, which visually resemble the headlights and taillights of an automobile. 'Tetra' is derived from 'Tetragonopterus', an older taxonomic classification for this group of fishes.
Cite this Entry
Wordmom. (2026). Definition of Head and taillight tetra. In Wordmom Dictionary. Retrieved Oct 14, 2026, from https://wordmom.com/dictionary/head and taillight tetra