/ Dictionary / Index P parasitology: Meaning and Definition of Find definitions for: par•a•si•tol•o•gy Pronunciation: (par"u-sī-tol'u-jē, -si-), [key] — n. the branch of biology dealing with parasites and the effects of parasitism. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. parasitoidism parasitosis Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language