Medical

Your palm is the inner part of your hand between your wrist and your fingers.

Patella is the formal name for the kneecap, a small round bone in the front of your knee. It helps protect the knee joint.

A paw is a kind of animal's foot. Generally animals like cats, dogs and ferrets that eat other animals have paws. Animals that get eaten usually have hooves not paws.
The paw in the picture belongs to a lion.

Your pelvis is the bony cradle that is between your legs and your spine.

The pelvis is the base support for your spine and upper body. It also protects organs like the bladder and helps you stand, walk, and move. You can feel it by pressing your hands on your hips.

Philtrum is the small groove in the middle of a person's face between the nose and the upper lip.

The picture is a baby's philtrum.

Pills, also called tablets, are small, usually hard lumps of medicine that are meant to be swallowed.

Your pinky finger is the smallest finger on your hand.

A plague is a widespread outbreak of disease or something else bad, such as a plague of locusts.

Plagues cause a lot of death or damage.

Platelets are small blood cells in your body. They help your blood clot so you stop bleeding when you get a cut.

In the picture, the platelets are the small purple dots.

Poisons are something that, when it gets into the system of a living organism, has a bad effect. If a creature comes into contact with enough poison, they will die.
Poisons are distinguished from venom and toxins in the way they are produced. A toxin is a poison produced by a natural process, and venom is a poison that is injected by a bite or sting.