Telangiectasis n. : Dilatation of the capillary vessels.

Example:
what is Hereditary Hemorrhagic Telangiectasis?

Taxonomy
telangiectasia, veins, Varicose veins, pregnancy, leg veins, factors, Treatment, free encyclopedia, Hereditary hemorrhagic telangiectasia, Venous hypertension, Ataxia telangiectasia, spider veins, Laser Treatment, reticular veins, legs, developmental abnormalities, valve, laser.

Defination from the web:
... Some telangiectasia are due to developmental abnormalities that can closely mimic the behaviour of benign vascular neoplasms. ...