Meaning of queen closer

queen' clos"er

Pronunciation: (klō'zer), [key]
— Masonry. Masonry.
  1. a brick of normal length and thickness but of half normal width, used to complete a course or to space regular bricks.
  2. a brick of half the usual length, for completing a course or for spacing regular bricks. Also calledCf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.