/ Dictionary / Index P psilosis: Meaning and Definition of Find definitions for: psi•lo•sis Pronunciation: (sī-lō'sis), [key] — n. Pathol. a falling out of the hair. sprue. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: psilosis (Thesaurus) Psiloriti psi particle Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language