/ Dictionary / Index P pentalpha: Meaning and Definition of Find definitions for: pen•tal•pha Pronunciation: (pen-tal'fu), [key] — n. pentagram. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pentahydroxy pentamerous Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language