categorem

from The Century Dictionary.

• noun Originally, a predicate; in logic— as used by the Stoics, a term which can be made the subject, or more especially the predicate, of a proposition; as used by the Peripatetics, the thing corresponding to a category.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a categorematic expression; a term capable of standing alone as the subject or predicate of a logical proposition