per-

1. The group of musical instruments that produce sound by being struck, including drums and cymbals, or the section of the orchestra playing such instruments.
2. The striking or detonating of a percussion cap in a firearm.
3. The impact of one object striking another, or the noise or shock created when two objects hit each other.
4. In medicine, an assessment method in which the surface of the body is struck with the fingertips to obtain sounds that can be heard or vibrations that can be felt.

It can determine the position, size, and consistency of an internal organ. It is done over the chest to determine the presence of normal air content in the lungs, and over the abdomen to evaluate air in the loops of the intestine.

1. A reference to medication that is administered or absorbed through the skin.
2. Through the unbroken skin; such as, medications applied directly to the skin (creams or ointments) or in time-release forms (skin patches).
3. Through the skin, as in a percutaneous biopsy.

An amount or allowance of so much every day.