Definition of gang flower in US English:

gang flower

noun

rare, historical
  • Common milkwort, Polygala vulgaris; also called rogation flower.

Origin

Late 16th century; earliest use found in John Gerard (c1545–1612), herbalist. From gang + flower, so called on account of its flowering in Rogation Week, after Gang Week, Gang Day.

Pronunciation

gang flower

/ˈɡaŋ ˌflaʊə/