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Webster 1913 Edition

Noun.

One who, or that which, improves.

Noun.

One who improves; one who makes himself or any thing else better; as an improver of horses or cattle.

That which improves,enriches or meliorates; as chalk is an improver of lands.

improver ‎(plural improvers)

something that, or someone who, improves

a substance added to cause improvement