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Full Idea
Prime matter signifies body considered without the consideration of any form or accident except only magnitude or extension, and aptness to receive form and accidents.
Gist of Idea
Prime matter is body considered with mere size and extension, and potential
Source
Thomas Hobbes (De Corpore (Elements, First Section) [1655], 2.08.24)
Book Ref
Hobbes,Thomas: 'Metaphysical Writings', ed/tr. Calkins,Mary Whiton [Open Court 1905], p.68
A Reaction
I take 'considered without' to indicate that he thinks of it as a psychological abstraction, rather than some actual existing thing.