The term MOAT FEATURE is a combination of two words, 'MOAT' and 'FEATURE'. A MOAT is a deep, wide ditch that is usually filled with water and is built around a castle or other structure as a defensive measure. A FEATURE is an attribute or aspect of something. Therefore, the term MOAT FEATURE refers to a FEATURE of a MOAT, such as its depth, width, or shape. The crossword solution for this term is DAM, which is a barrier built across a river or other body of water to control the flow of water.