Definition of dog-briar in US English:

dog-briar

noun

rare, historical
  • Any of several wild roses, especially the sweetbriar, Rosa eglanteria.

Origin

Mid 16th century; earliest use found in John Palsgrave (d. 1554), teacher and scholar of languages. From dog + brier, after classical Latin sentis canis or ancient Greek κυνόσβατος.

Pronunciation

dog-briar

/ˈdɒɡˌbrʌɪə/