a person or thing that improves.
a substance or agent added to improve a food, especially as a preservative.

Origin of improver

First recorded in 1640–50; improve + -er1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for improver

Historical Examples of improver

  • That night there was blank dismay in every Avonlea house where an Improver lived.

    Anne Of Avonlea

    Lucy Maud Montgomery

  • He was the improver of that noble instrument the Orrery, which, in honour of him, was called after his name.


    George Bryan

  • Perhaps he muttered this interrogatory in the spirit of an improver and adorner of nature.


    Robert Montgomery Bird

  • The improver has sought to increase the width of the red ring.

    Wood and Garden

    Gertrude Jekyll

  • It is peculiarly valuable as a fertilizer and as an improver of soils.