moat
UK[məʊt]US[moʊt]
n
A deep, wide ditch, usually filled with water, that surrounds a castle, fort, or town to protect it from attack.
Etymology
The word 'moat' entered English in the late 14th century from the Old French 'mote,' meaning a mound, embankment, or ditch. This Old French term likely has Germanic origins, possibly related to a base meaning "mud" or "peat," which is also seen in the Middle Dutch 'mot' referring to turf or peat used in fortifications. The semantic journey is from the material (earth, mud) used to build a defensive mound, to the mound itself, and finally to the ditch that typically surrounded such a fortified mound. The modern sense, specifically denoting the water-filled defensive ditch, became firmly established in English by the 16th century.
Analysis
The word 'moat' is a simplex word borrowed from Old French. It does not contain separable, meaningful morphemes within its modern English spelling.
Examples
The ancient castle was surrounded by a deep moat filled with water.
They crossed the wooden drawbridge over the moat to enter the fortress.
Modern security systems are the digital equivalent of a castle's moat.