Sentence:  The <WSD>target</WSD> or buckler was carried by the heavy armed foot, it answered to the scutum of the Romans; its form was sometimes that of a rectangular parallelogram, but more commonly had its bottom rounded off; it was generally convex, being curved in its breadth. 
Meaning of the word marked with <WSD> tags:  A shield resembling the Roman scutum, larger than the modern buckler.