Ich″thin (ĭk″thĭn), n. [Gr. ιχθὔσ fish.] (Physiol. Chem.) A nitrogenous substance resembling vitellin, present in the egg yolk of cartilaginous fishes.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.