Definition of Malvernian in US English:

Malvernian

adjective

Geology
  • Of, relating to, or characteristic of the Malvern Hills; specifically (a) designating a Precambrian series of plutonic rocks that forms most of the hills; also used as noun (usually with the); (b) designating a north–south orientation like that of the hills.

Origin

Late 19th century; earliest use found in Quarterly Journal of the Geological Society of London. From the name of the MalvernHills in Hereford and Worcester, England + -ian.