matter in the solid phase has definite volume
solids has definite_shape_and_volume solid_animal_matter is solid_object. white_matter is solid_animal_matter. grey_matter is solid_animal_matter. solid_rocky_planetary_stuff is solid. three_forms_of_matter is solid_liquid_and_gas. solid is state_of_matter. solid_animal_matter is organic_matter. fecal_matter is solid_object.