scutum

An 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.

A scute.

A shield-like protection, such as the scutum protecting the back of a hard tick (cf. alloscutum, conscutum).

A tick's eye, if present, is a mere roundish lucent area at the margin of the scutum about opposite the second coxa.

One of the two lower valves of the operculum of a barnacle.

The kneecap.

A small autumn constellation of the northern sky, said to resemble a shield. It lies between the constellations of Aquila, Sagittarius, and the tail of Serpens.