The horse was trained to battle, and would fight for me like an extra arm.

First, get the cleaning 'hot to clear up these extra arms and legs off the floor.

Had they noticed the extra arm growing from my shoulder?

Reed generally wears a battle suit with two extra arms.

You'd need an extra arm to accomplish such a task, and you don't have one.

For example, 22p+ means that there is an extra short arm added to the 22nd pair of chromosomes.

The Menel had no fingers, but they did have two extra arms.

Didn't I hear you say a while ago that you'd like to have an extra arm yourself?

Then things stopped whirling around for me; such were the advantages of a few extra arms.

Nine extra arm's lengths seemed to put me on the safe side.