(1):

(n.) A sensation in the skin occasioned (or resembling that occasioned) by the itch eruption; - called also scabies, psora, etc.

(2):

(n.) Any itching eruption.

(3):

(n.) 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.

(4):

(v. i.) To have a constant desire or teasing uneasiness; to long for; as, itching ears.

(5):

(v. i.) To have an uneasy sensation in the skin, which inclines the person to scratch the part affected.

(6):

(n.) A constant irritating desire.