MERLON, in architecture, the solid part of an embattled parapet between the embrasures, sometimes pierced by loopholes. The word is French, adapted from Ital. mer/one, possibly a shortened form of mergola, connected with Lat. mergae, pitchfork, or from a diminutive moerulus, from munis (moerus), a wall.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)