Definition of devil's milk in English:

devil's milk

Pronunciation /ˌdɛvlz ˈmɪlk/

noun

historical, rare
  • Either of two common spurges, petty spurge, Euphorbia peplus, and sun spurge, E. helioscopia; (also) the white latex contained in these plants, which can irritate the skin.

Origin

Late 16th century; earliest use found in Henry Lyte (1529–1607), botanist and antiquary. From the genitive of devil + milk, after Dutch duivelsmelk and German Teufelsmilch.