The Collaborative International Dictionary of English v.0.48:

Rhematic \Rhe*mat"ic\, a. [Gr. ???? of or for a verb, fr. ???,
   ???, a sentence. See Rhetoric.] (Gram.)
   Having a verb for its base; derived from a verb; as, rhematic
   adjectives. --Ftzed. Hall.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Rhematic \Rhe*mat"ic\, n.
   The doctrine of propositions or sentences. --Coleridge.
   [1913 Webster]