itch

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An irritating skin sensation causing a desire to scratch.
• noun Any of various skin disorders, such as scabies, marked by intense irritation and itching.
• noun A restless desire or craving for something.
• intransitive verb To feel, have, or produce an itch.
• intransitive verb To have a desire to scratch.
• intransitive verb To have a persistent, restless craving.
• intransitive verb To cause to itch.
• intransitive verb To scratch (an itch).

from The Century Dictionary.

• To feel a peculiar irritation or tingling of the skin, producing an inclination to scratch the part so affected.
• Hence To experience a provoking, teasing, or tingling desire to do or to get something.
• noun A tingling sensation of irritation in the skin, produced by disease (see def. 2) or in any other way.
• noun An inflammation of the human skin, caused by the presence of a minute mite, Sarcoptes scabiei (see itch-mite), presenting papules, vesicles, and pustules, and accompanied with great itching; scabies.
• noun Hence An uneasy longing or propensity; a teasing or tingling desire: as, an itch for praise; an itch for scribbling.
• noun See the qualifying words.

from the GNU version of the Collaborative International Dictionary of English.

• noun (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.
• noun Any itching eruption.
• noun A sensation in the skin occasioned (or resembling that occasioned) by the itch eruption; -- called also scabies, psora, etc.
• noun A constant irritating desire.
• noun See under Baker.
• noun sycosis.
• noun an eczema of the hands attended with much itching, occurring among bricklayers.
• noun an itching eruption, being a variety of eczema, produced by the sugar mite (Tyrogluphus sacchari).
• noun (Zoöl.) 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.
• noun (Zoöl.) Same as Itch insect, above. Also, other similar mites affecting the lower animals, as the horse and ox.
• noun a variety of eczema, due to the action of sugar upon the skin.
• noun eczema of the hands and arms, occurring among washerwomen.
• intransitive verb To have an uneasy sensation in the skin, which inclines the person to scratch the part affected.
• intransitive verb To have a constant desire or teasing uneasiness; to long for.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A sensation felt on an area of the skin that causes a person or animal to want to scratch.
• noun A desire or want.
• verb intransitive To feel itchy; to feel a need to be scratched.
• verb intransitive To want or desire.
• verb transitive To cause to feel an itch.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb have or perceive an itch
• verb have a strong desire or urge to do something
• verb cause to perceive an itch
• noun a strong restless desire
• noun an irritating cutaneous sensation that produces a desire to scratch
• verb scrape or rub as if to relieve itching
• noun a contagious skin infection caused by the itch mite; characterized by persistent itching and skin irritation