/ Dictionary / Index P pin knot: Meaning and Definition of Find definitions for: pin' knot" Pronunciation: [key] a knot in lumber less than in. (1.3 cm) in diameter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pink noise pinko Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language