Stickler

Webster's Dictionary of the English Language

·vt One who stickles.

II. Stickler ·vt One who arbitrates a duel; a sidesman to a fencer; a second; an Umpire.

III. Stickler ·vt One who pertinaciously contends for some trifling things, as a point of etiquette; an unreasonable, obstinate contender; as, a stickler for ceremony.