The Collaborative International Dictionary of English v.0.48:

Hydrosulphide \Hy`dro*sul"phide\, n. (Chem.)
   One of a series of compounds, derived from hydrogen sulphide
   by the replacement of half its hydrogen by a base or basic
   radical; as, potassium hydrosulphide, KSH. The
   hydrosulphides are analogous to the hydrates and include the
   mercaptans.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sulphydrate \Sul*phy"drate\, n. (Chem.)
   A compound, analogous to a hydrate, regarded as a salt of
   sulphydric acid, or as a derivative of hydrogen sulphide in
   which one half of the hydrogen is replaced by a base (as
   potassium sulphydrate, KSH), or as a hydrate in which the
   oxygen has been wholly or partially replaced by sulphur.
   [1913 Webster]

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

KSH
       Key Strokes per Hour


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

KSH
       Korn SHell (Unix, Shell)


The Free On-line Dictionary of Computing (30 December 2018):

Korn Shell
ksh

   (ksh) A command interpreter for Unix.

   SKsh is an AmigaDos-specific version and pdksh is a free
   Unix version.

   [More details?]