/ Dictionary / Index P picoline: Meaning and Definition of Find definitions for: pic•o•line Pronunciation: (pik'u-lēn", -lin), [key] — n. Chem. any of three isomeric methyl derivatives of pyridine having the formula CHN, obtained from coal tar as a colorless oily liquid with a strong odor. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. picogram Pico Rivera Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language