Category: N

Meaning orshowing ‘no’. Indicating that something being tested for is not present. Possessing a numerical value that is less than zero. A terminal or electrode exhibiting an excess of electrons compared to its normal state is referred to as a negatively charged terminal. Electrons flow away from the negative terminal of a voltage source.  

A state in which someone does not have the opportunity or capacity to fulfil his or her basic needs.  

The puncture of a cataract with a needle. A form of capsulotomy in which a sharp needle is used to make a hole in the capsule surrounding the lens of the eye. An operation performed in the treatment of cataracts, in which the anterior lens capsule of the eye is opened with a needle, allowing…

An accidental pricking of your own skin by a needle, as by a nurse picking up a used syringe. An accident in which a used hypodermic needle pierces the skin of an individual other than the patient. This is a serious cause of injury and infection for health care professionals, especially since such diseases as…

Destruction of muscle tissue caused by using a large needle for intramuscular injections.  

The dissection of a dead body. The surgical extraction of a sequestrum.    

A severe bacterial infection that causes cell tissue to decay rapidly. Also known as cellulitis (often referred to in the popular media as ‘flesh-eating killer-bug’ infection). A potentially lethal infection caused by the gram-positive bacterium Streptococcus pyogenes, which has the property of producing dangerous exotoxins. The infection, which starts in the layer of fascia under…

A disorder in which patches of dead tissue are found in the small or large intestine as a result of severe bacterial infection. It occurs in babies, especially premature ones.  

A condition in which dead sperm exist in the semen. The presence of either dead or motionless spermatozoa in the semen. A state where the semen comprises solely of non-viable sperm cells.