/ Dictionary / Index P pirarucu: Meaning and Definition of Find definitions for: pi•ra•ru•cu Pronunciation: (pi-rär'u-k"), [key] — n. the arapaima. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Pirapóra pirate Related Content Daily Word Quiz: pugilist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language