ich

noun
variants: also ick \ ˈik How to pronounce ick (audio) \
plural ichs also icks

Medical Definition of ich

: a severe dermatitis of freshwater fish caused by a protozoan of the genus Ichthyophthirius (I. multifiliis) and especially destructive in aquariums and hatcheries

called also ichthyophthiriasis, ichthyophthirius

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