noun, masculine/sɛ̃ də ɡlas/
ice saints (the saints Pancras of Rome, Servatius of Tongeren, Mamertus of Vienne and/or Boniface of Tarsus, and sometimes Sophia of Rome, whose feast days are on May 11th though 15th); ice saints, blackthorn winter, blackberry winter (spell of cold weather in May on or around those dates)