A protective garment worn on a knee to protect it from injury, for example due to a blow or a fall.
The kneecap.
One of the two lower valves of the operculum of a barnacle.
A scute.
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 shield-like protection, such as the scutum protecting the back of a hard tick (cf. alloscutum, conscutum)