hookkeeper

hook +‎ keeper

hookkeeper (plural hookkeepers)

1. A wire ring that holds a fly-fishing fishhook in place while rigged.
   • 1988, Dale P. Clemens., Advanced Custom Rod Building, page 108:

     I've used it in my thread work, such as a group of three single- thread inlays in guide wraps and/or hookkeeper wraps.

   • 1999, C. Boyd Pfeiffer., The Complete Book of Tackle-Making, page 462:

     Alignment is a matter of choice, but most rod-builders place the hookkeeper in line with the guides.

   • 2002, Cathy Beck., Cathy Beck's Fly-Fishing Handbook, page 7:

     The hookkeeper is located just above the handle and is standard equipment on most rods.

Hookkeeper and its respective derivations, along with bookkeeper and its derivations, constitute the only English words with three consecutive doubled letters. Hyphenated words include sweet-toothed and hoof-footed.