matter


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Related to matter: States of matter

matter

 [mat´er]
1. physical material having form and weight under ordinary conditions; called also substance.
2. pus.
gray matter areas of the nervous system where the nerve fibers are unmyelinated (not enveloped by a myelin sheath); it contains the bodies of the nerve cells. Tissue composed of myelinated fibers is called white matter. The cerebral cortex is entirely composed of gray matter and the cerebellum also contains some deep-seated masses of it. The spinal cord has a central core of gray matter surrounded by white matter; in cross section, its gray matter is shaped approximately like the letter H. Called also substantia grisea and gray substance.
white matter areas of the nervous system composed mostly of myelinated nerve fibers (those having myelin sheaths) constituting the conducting portion of the brain and spinal cord. Tissue composed of unmyelinated fibers is called gray matter. Called also substantia alba and white substance.

sub·stance

(sŭb'stănts),
Material.
Synonym(s): substantia [TA], matter
[L. substantia, essence, material, fr. sub- sto, to stand under, be present]

matter

/mat·ter/ (mat´er)
1. substance; anything that occupies space.
2. pus.

gray matter  substantia grisea.
white matter  substantia alba.

matter

(măt′ər)
n.
1. A specific type of substance.
2. Discharge or waste, such as pus or feces, from a living organism.

matter

Etymology: L, materia
1 anything that has mass and occupies space.
2 any substance not otherwise identified as to its constituents, such as gray matter, pus, or serum exuding from a wound.

matter

Anatomy
Material substance that occupies cavities.

Physics
Material substance that occupies space.

matter

Anatomy Stuff that occupies cavities. See Gray matter, White matter.

sub·stance

(sŭb'stăns)
Material.
Synonym(s): substantia [TA] , matter.
[L. substantia, essence, material, fr. sub-sto, to stand under, be present]

matter

that which constitutes the substance of physical forms, has mass, occupies space and can be quantified.

matter

1. physical material having form and weight under ordinary conditions of gravity.
2. pus.

gray matter
matter of the central nervous system, which represents the aggregations of the nerve cells.
white matter
matter of the central nervous system, which comprises the axons of the nerve cells.
References in periodicals archive ?
The stars add up to the mass of about 100 billion suns; the dark matter is roughly 10 times as massive.
Their simulations show that dark matter should be densely packed in the centres of galaxies.
This proves in a simple and direct way that dark matter exists," says Maxim Markevitch of the Harvard-Smithsonian Center for Astrophysics.
Environmental Protection Agency spokesman John Millet said the agency exempted mining and agriculture from being regulated under coarse particulate matter standards because there is no evidence that windblown dirt and dust kicked up in earth-moving activities is unhealthful.
We are determining whether the blessing of gay couples--committed, long-term relationships--is a doctrinal matter.
Although recent re-analyses have challenged the strength of the earlier findings, the fact remains that the influence of socioeconomic status on achievement is by no means uniform across nations, age/grade levels, gender, and subject matter.
The dimmest Xer can understand that prevention matters.
In a recent, fully reviewed opinion with no dissents, the Tax Court signaled that expansive deficiency notice language may no longer rescue the Service from a shift in the burden of proof when it raises a new matter before the court.
See In the Matter of Citizens Bank of Clovis, FDIC-91-406b, 2 FDIC Enf.
The recently enacted Internal Revenue Service Restructuring and Reform Act of 1998 includes a provision creating a confidentiality privilege between clients and the CPAs who represent them in noncriminal federal tax matters (see JofA, Sept.
Throughout any period during which any Alumax class C common stock was outstanding, each share of the class B common stock (held by the Mitsui Group) had one vote, and each share of the class C common stock (held by the Amax Group) had four votes, on each matter submitted to the Alumax shareholders.