merlon

noun

1. (in a battlement) the solid part between two crenels.

noun

1. fortifications the solid upright section in a crenellated battlement

n.“solid part of a battlement,” 1704, from French merlon (17c.), from Italian merlone, augmentative of merlo “battlement,” perhaps a contraction of mergola, diminutive of Latin mergae “two-pronged pitchfork.”