Webster's New World Medical Dictionary

glioblastoma multiforme
A highly malignant,
rapidly growing type of brain tumor that arises from
glial cells in the brain. Early symptoms may include
sleepiness, headache, and vomiting. Also called a
grade IV astrocytoma. Treatment can involve surgery
and radiation treatment.
glioma
A brain tumor that begins in a glial cell in
the brain or spinal cord. Malignant gliomas are the
most common primary tumors of the central nerv-
ous system. They are often resistant to treatment and
carry a poor prognosis. Astrocytomas are the most
common glial tumors. See also 
glioma, optic.
glioma, optic
A rare, most commonly benign
tumor on the optic nerve or the optic chiasm (the
crossing of the two optic nerves). Optic gliomas
cause pressure and destruction of normal optic
nerve tissue. They are most common in children
and teens. Optic gliomas are strongly associated
with neurofibromatosis (NF1).
gliosis
A process leading to scars in the central
nervous system that involves the production of a
dense fibrous network of glial cells (supporting
cells) in areas of damage. Gliosis is a prominent
feature of many diseases of the central nervous sys-
tem, including multiple sclerosis and stroke. After a
stroke, nerve cells die and are replaced by areas of
gliosis. See also 
glial cell.
globus 1
A globe or sphere, used in various con-
texts in medicine.
2
The sensation of having a
lump in the throat when nothing is really there. Also
known as globus hystericus.
globus hystericus
See 
globus.
globus major
The head of the epididymis, the
structure just behind the testis.
globus minor
The tail of the epididymis, a cord-
like structure just behind the testis.
globus pallidus
A comparatively pale-looking,
spherical area in the brain. The globus pallidus is
specifically part of the lentiform nucleus, which in
turn is part of the striate body, a component of the
basal ganglia. Also called pale globe, palladum, and
paleostriatum.