Pronunciation: (rō'lok"; for 3 also Naut. rol'uk, rul'-), [key]
1. Archit.one of several concentric rings of masonry forming an arch.
2. a brick laid on edge, esp. as a header. Cf. soldier (def. 7).
3. Chiefly Brit.oarlock. Also,rollock (for defs. 1, 2).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.