phle ‧ bi ‧ tis /flɪˈbaɪtəs, flɪˈbaɪtɪs/ BrE AmE noun [uncountable] medical
[ Date: 1800-1900 ; Language: Modern Latin ; Origin: Greek phleps 'vein' ]
a condition in which there is swelling and roughness on the inside surface of a ↑ vein (=tube that carries blood through your body)