merlon

詳細解釋：

mer.lon

n.（名詞）
A solid portion of a crenelated wall between two open spaces.
城齒：城堡雉堞牆上兩塊敞開空間中的實牆

來源：
French
法文
from Italian merlone [augmentative of] merlo [battlement]
源自 義大利語 merlone [] merlo的增義成分 [城垛]
perhaps from Medieval Latin merulus
可能源自 中世紀拉丁語 merulus
from Latin [merle (from their imagined similarity to blackbirds sitting on a wall)]
源自 拉丁語 [烏鶇（因它們與棲於牆頭的烏鶇相象而得名）]