Retarding. Preventing a free movement.

Revoluble. The turning or swinging motion of a body like the earth in its movement around the sun. See Rotative. To cause to move as in an orbit or circle.

Resilient. Springy; having the quality of elasticity.

Reversed. Changed about; turned front side to the rear.

Rotative. That which turns, like a shaft. The movement of the earth on its axis is rotative.

Saturation. Putting one substance into another until it will hold no more. For instance, adding salt to water until the water cannot take up any more.

Security. Safety, assuredness that there will be no danger.

Segment. A part eut off from a circle. Distinguished from a sector, which might be likened to the form of one of the sections of an orange.

Sexagonal. Six-sided.

Sine of the Angle. The line dropped from the highest point of an
angle to the line which runs out horizontally.