say it: lang-KA-stree-uhn
lancastrian is a noun and adjective meaning "a member (or supporter) of the house of Lancaster". It carries 4 recorded senses.
a member (or supporter) of the house of Lancaster
a resident of Lancaster
of or relating to the former English royal house or their supporters
“Lancastrian royalty”
of or relating to the English city of Lancaster or its residents
“Lancastrian city center”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for lancastrian come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.