[1] : The Collaborative International Dictionary of English v.0.48

itch \itch\, n.
   1. med. an eruption of small, isolated, acuminated
      vesicles, produced by the entrance of a parasitic mite
      the sarcoptes scabei, and attended with itching. it is
      transmissible by contact.
      1913 webster

   2. any itching eruption.
      1913 webster

   3. a sensation in the skin occasioned or resembling that
      occasioned by the itch eruption; -- called also
      scabies, psora, etc.
      1913 webster

   4. a constant irritating desire.
      1913 webster

            an itch of being thought a divine king. --dryden.
      1913 webster

   baker's itch. see under baker.

   barber's itch, sycosis.

   bricklayer's itch, an eczema of the hands attended with
      much itching, occurring among bricklayers.

   grocer's itch, an itching eruption, being a variety of
      eczema, produced by the sugar mite tyrogluphus
      sacchari.

   itch insect zool., a small parasitic mite sarcoptes
      scabei which burrows and breeds beneath the human skin,
      thus causing the disease known as the itch. see illust. in
      append.

   itch mite. zool. same as itch insect, above. also,
      other similar mites affecting the lower animals, as the
      horse and ox.

   sugar baker's itch, a variety of eczema, due to the action
      of sugar upon the skin.

   washerwoman's itch, eczema of the hands and arms, occurring
      among washerwomen.
      1913 webster
see also:
sarcoptes scabei scabies psora baker's itch baker barber's itch 
bricklayer's itch grocer's itch tyrogluphus sacchari itch insect sarcoptes scabei 
itch mite sugar baker's itch washerwoman's itch 

Sarcoptes >> S Words
Sarcoptes, definition of term: Sarcoptes
sarcoptes_pag1.html