From Online Dictionary of Crystallography

مسحوق (Ar). Poudre (Fr). Pulver (Ge). Polvere (It). 粉末 (Ja). Polvo (Sp).

A powder is defined in EN-1330-11 (2007) as a large number of crystallites and/or particles (i.e. grains, agglomerates or aggregates; crystalline or non-crystalline) irrespective of any adhesion between them and thus can be a loose powder (in the sense of common language), a solid block, a thin film or even a liquid. An ideal powder is represented by a virtually unlimited number of sufficiently sized, randomly oriented and spherical crystallites.