Source : Webster's Revised Unabridged Dictionary (1913)

Ichthyophthira \Ich`thy*oph*thi"ra\, n. pl. [NL., fr. Gr. ?, ?,
   a fish + ? a louse.] (Zo["o]l.)
   A division of copepod crustaceans, including numerous species
   parasitic on fishes.