Any solid or liquid in a finely subdivided state, especially when considered as an atmospheric pollutant.

of, or relating to facts only; literal, realistic / lacking emotion or colour / straightforward, blunt, frank; treating the situation as normal; not embarrassed, coy, or dramatic.

(neuroanatomy) A region of the central nervous system containing myelinated nerve fibres and no dendrites

As though stating a fact. / As though the situation is normal and not unusual; not dramatically or fancifully.

(rare, proscribed) Nonstandard form of as a matter of fact.

(physics) A hypothetical mirrored counterpart to ordinary physical matter.

(physics) mirror matter

Alternative form of subject matter

Somewhat matter-of-fact.

(law) A matter involving a judicial inquiry into the applicable law.