| NOUN | cognition | ichthyology | the branch of zoology that studies fishes |
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| Meaning | The branch of zoology that studies fishes. | |
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| Category of | heterocercal | possessing a tail with the upper lobe larger / larger than the lower and with the vertebral column prolonged into the upper lobe |
| homocercal | possessing a symmetrical tail that extends beyond the end of the vertebral column (as in most bony fishes) | |
| Broader | zoology, zoological science | The branch of biology that studies animals |
| Nouns | ichthyologist | a zoologist who studies fishes |