Webster's New World Medical Dictionary

nodular melanoma
See 
melanoma, nodular.
nodule
A small collection of tissue that is palpable
(can be felt) at any level of the skin (in the epidermis,
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nodule
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dermis, or subcutis) or in another tissue of the body.
Nodules characteristically range in size from 1 to 2
cm in diameter. 
noncompliance
Failure or refusal to comply. In
medicine, the term noncompliance is commonly
used in regard to a patient who does not take a pre-
scribed medication or follow a prescribed course of
treatment. A person who demonstrates noncompli-
ance is said to be noncompliant.
nondisjunction
Failure of paired chromosomes
to separate (to disjoin) during cell division, so that
both chromosomes go to one daughter cell and
none go to the other. Nondisjunction causes errors
in chromosome number, such as trisomy 21 (Down
syndrome) and monosomy X (Turner syndrome).
It is also a common cause of early spontaneous
abortions.
nongonococcal urethritis
An inflammation of
the urethra due to infections other than gonorrhea.
Abbreviated NGU. NGU is far more common in men
than in women and is transmitted by sexual inter-
course. Chlamydia trachomatis is the organism most
commonly responsible for NGU, but a number of
different organisms can be the cause of NGU.
non-Hodgkin’s lymphoma
See 
lymphoma,
non-Hodgkin’s.
nonmelanoma skin cancer
Skin cancer that
does not involve melanocytes. Basal cell cancer and
squamous cell cancer are examples of non-
melanoma skin cancers.