/ Dictionary / Index L locking plate: Meaning and Definition of Find definitions for: lock'ing plate" Pronunciation: [key] — Horol. Horol. a narrow wheel geared to a striking train or other mechanism and having a notched rim engaging with another mechanism permitting it to rotate through a specific arc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. locking piece locking pliers Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language