Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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conservation of matter a principle of physics that asserts that the total matter in a closed system remains constant, regardless of changes in the system.
gray matter the grayish nerve tissue of the brain and spinal cord, consisting largely of nerve cells and fibers. (Cf. white matter.) [2 definitions]
matter of course an event that is logically or naturally expected to occur.
matter-of-course occurring in the normal or logical course of events; inevitable; routine. [2 definitions]
matter-of-fact concerned with facts; unimaginative or literal. [2 definitions]
subject matter the core or substance of that which is being examined or discussed.
white matter the nerve tissue, esp. of the brain and spinal cord, which is fibrous and nearly white. (Cf. gray matter.)