\Aug*ment"a*tive\, a. [Cf. F. augmentatif.]
Having the quality or power of augmenting; expressing
augmentation. -- {Aug*ment"a*tive*ly}, adv.

\Aug*ment"a*tive\, n. (Gram.)
A word which expresses with augmented force the idea or the
properties of the term from which it is derived; as, dullard,
one very dull. Opposed to {diminutive}. --Gibbs.