a small digital computer based on a microprocessor and designed to be used by one person at a time

a removable circuit board for a personal computer; fits into a slot in the mother board

a person who helps in identifying or preventing or treating illness or disability

a drug used as an anesthetic by veterinarians; illicitly taken (originally in the form of powder or `dust') for its effects as a hallucinogen

a proportion in relation to a whole (which is usually the amount per hundred)