Webster's New World Medical Dictionary

subclinical disease
An illness that is staying
below the surface of clinical detection. A subclinical
disease has no recognizable clinical findings. It is
distinct from a clinical disease, which has signs and
symptoms that can be recognized. Many diseases,
including diabetes, hypothyroidism, and rheuma-
toid arthritis, are frequently subclinical before they
surface as clinical diseases.
subcu
See 
subcutaneous.
subcutaneous
Under the skin. For example, a
subcutaneous injection is an injection in which a
needle is inserted just under the skin. Also known
as subcu. Abbreviated subq.
subcutaneous hematoma
See 
hematoma, sub-
cutaneous.
subcutaneous injection
An injection in which a
needle is inserted just under the skin. A drug can
then be delivered into the tissues below the skin.
After the injection, the drug moves into small blood
vessels and the bloodstream. Subcutaneous injection
is used with many protein and polypeptide drugs,
such as insulin, that, if given by mouth, would be
broken down and digested in the intestinal tract.
subdural hematoma
See 
hematoma, subdural.
subglottis
The lower part of the larynx, the area
from just below the vocal cords down to the top of
the trachea.
sublingual
Underneath the tongue. For example,
a sublingual medication is a type of lozenge that is
dissolved under the tongue.
sublingual gland
A salivary gland that is located
under the floor of the mouth, close to the midline.
The sublingual gland is the smallest of the three
major salivary glands (the parotid, submandibular,
and sublingual glands).
subluxation
Partial dislocation of a joint. A com-
plete dislocation is a luxation.