Definition of pine blister in US English:

pine blister

noun

  • 1(More fully "pine blister rust") a disease caused by fungi of the genus Cronartium, characterized by yellowish swellings on the bark; compare white pine blister rust.

  • 2A pine needle rust, caused by fungi of the genus Coleosporium (rare).

Origin

Late 19th century; earliest use found in Harry Marshall Ward (1854–1906).