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Webster 1913 Edition

Duller

Dull′er

,

Noun.

One who, or that which, dulls.

Webster 1828 Edition

Duller

DULLER

,

Noun.

That which makes dull.

Definition 2024

duller

duller

English

Adjective

duller

comparative form of dull: more dull

Noun

duller ‎(plural dullers)

One who, or that which, dulls.
- Beaumont and Fletcher
  But, of all, your grace must fly phlebotomy, fresh pork, conger, and clarified whey: they are all dullers of the vital spirits.