1.NounAn oblong shield made of boards or wickerwork covered with leather, with sometimes an iron rim; carried chiefly by the heavily armed infantry of the Roman army.
2.NounA scute.
3.NounA shield-like protection, such as the scutum protecting the back of a hard tick (cf. alloscutum, conscutum).
4.NounOne of the two lower valves of the operculum of a barnacle.