Webster’s Revised Unabridged Dictionary · 1913
Ichthyology
Ich′thy·ol′o·gy (·jy̆), n. [Gr. ἰχθύς, -ύος, a fish + -logy: cf. F. ichthyologie.] The natural history of fishes; that branch of zoölogy which relates to fishes, including their structure, classification, and habits.