\Itch\, v. i. [imp. & p. p. {Itched}; p. pr. & vb. n.
{Itching}.] [OE. icchen, ?icchen, AS. giccan; akin to D.
jeuken, joken, G. jucken, OHG. jucchen.]
1. To have an uneasy sensation in the skin, which inclines
   the person to scratch the part affected.
         My mouth hath itched all this long day. --Chaucer.
2. To have a constant desire or teasing uneasiness; to long
   for; as, itching ears. ``An itching palm.'' --Shak.

\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.
2. Any itching eruption.
3. A sensation in the skin occasioned (or resembling that
   occasioned) by the itch eruption; -- called also
   {scabies}, {psora}, etc.
4. A constant irritating desire.
         An itch of being thought a divine king. --Dryden.
{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} (Zo["o]l.), 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}. (Zo["o]l.) 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.