Etymology
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ichthyology (n.)

"the science of fishes; the department of zoology which treats of fishes," 1640s, from ichthyo- "fish" + -logy. Related: Ichthyologist; ichthyological.

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piscatology (n.)

"scientific study of fish, ichthyology," 1857, a jocular hybrid from Latin piscatus, past participle of piscari "to fish," from pisces "a fish" (from PIE root *pisk- "a fish") + -ology.

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