/ Dictionary / Index P psilomelane: Meaning and Definition of Find definitions for: psi•lom•e•lane Pronunciation: (sī-lom'u-lān"), [key] — n. a common mineral consisting of a mixture of pyrolusite and other oxides of manganese, usually found in black, rounded masses: an ore of manganese. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: psilomelane (Thesaurus) psilocybin Psiloriti 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