1.nounAn oblong shield made of boards or wickerwork covered with leather, with sometimes an iron rim; carried chiefly by the heavy-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.