'primary substance' is a correct and usable phrase in written English.
It can be used in a variety of contexts, but usually refers to a material or substance which is the original source of something else. For example, "The primary substance from which this plastic bottle was created was petroleum."
Thus, Thales considered water as the primary substance and saw all things as "full of gods"; for Anaximenes, air was the universal animating principle of the world, and for Heracleitus it was fire.
Emanationism, philosophical and theological theory that sees all of creation as an unwilled, necessary, and spontaneous outflow of contingent beings of descending perfection from an infinite, undiminished, unchanged primary substance.
They showed an artist reveling in photography's primary substance, light, but maintaining the same level of artifice and even abstraction, and the same awareness of her medium that pervades all her art.
Hence, any species in both substance and some accidental category would be said-of and not said-of primary substance.
Corresponding to that subject, one might think, is an entity of some kind, namely a primary substance.
Thus, everything in the category of substance that is not itself a primary substance is, ultimately, 'said of' primary substances.
The second is, like a primary substance, non-predicable, but it can be present in a subject.
Space is defined as "a primary substance or seat or immobile and incorporeal capacity, able to receive any body".
This horse is a primary substance, and horse, the species to which it belongs, is a secondary substance.
In the Categories, this distinction is marked by the terms 'primary substance' and 'secondary substance'.
Exclusion criteria included diagnosis of dissociative disorder, bipolar disorder, major depressive disorder, schizoaffective disorder, schizophreniform disorder, autistic disorder, or primary substance-induced psychotic disorder.
