say it: BRAHY-ur
briar is a noun meaning "Eurasian rose with prickly stems and fragrant leaves and bright pink flowers followed by scarlet hips". It is pronounced /ˈbɹaɪɚ/ — BRAHY-ur. It carries 4 recorded senses.
Eurasian rose with prickly stems and fragrant leaves and bright pink flowers followed by scarlet hips
evergreen treelike Mediterranean shrub having fragrant white flowers in large terminal panicles and hard woody roots used to make tobacco pipes
a pipe made from the root (briarroot) of the tree heath
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 briar 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.