## Etymology
A shortening of the New Latin genus name Ichthyophthirius, from Ancient Greek ichthys ('fish') + phtheir ('louse'), naming the protozoan parasite that causes white-spot disease.

## AI Etymology
ich has the recorded history: A shortening of the New Latin genus name Ichthyophthirius, from Ancient Greek ichthys ('fish') + phtheir ('louse'), naming the protozoan parasite that causes white-spot disease. The form is also shaped by later English word-formation, since shortening, alteration, or polite substitution can be as important as direct inheritance. In present English, the noun sense is "a common protozoan disease of aquarium fish causing white spots", so the historical development ends in a clearly identifiable modern dictionary use. Its semantic neighborhood includes ichthyophthirius and whitespot, which helps locate the modern sense without adding a separate etymological claim. The named historical forms include Ancient Greek ichthys.

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