slit : Idioms & Phrases

• (Anat.), an opening behind and below the head of most fishes, and some amphibians, by which the water from the gills is discharged. In most fishes there is a single opening on each side, but in the sharks and rays there are five, or more, on each side.

Webster 1913

• noun one of a series of slit openings in the pharynxes of fishes and aquatic amphibians through which water passes
  gill cleft; branchial cleft.
  

WordNet

• . (Anat.) See Gill opening, under Gill.

Webster 1913

• noun the fissure between the labia majora
  pudendal slit; rima pudendi; pudendal cleavage; rima vulvae; pudendal cleft; urogenital cleft.
  

WordNet

• noun (ophthalmology) a lamp that emits a narrow but intense beam of light that enables an ophthalmologist, using a microscope, to view the retina and optic nerve
  

WordNet

• noun narrow trench for shelter in battle
  

WordNet

Slit"-shell" noun

Definitions

1. (Zoöl.) Any species of Pleurotomaria, a genus of beautiful, pearly, spiral gastropod shells having a deep slit in the outer lip. Many fossil species are known, and a few living ones are found in deep water in tropical seas.

Webster 1913

• noun the fissure between the labia majora
  pudendal slit; rima pudendi; pudendal cleavage; rima vulvae; pudendal cleft; urogenital cleft.
  

WordNet