noun, feminine/ɛ̃.fɛk.sjɔ̃ sɛk.sɥɛl.mɑ̃ tʁɑ̃s.mi.sibl/plural: infections sexuellement transmissibles
infection sexuellement transmissible is feminine in French.
sexually transmitted disease
Synonyms: maladie sexuellement transmissible, maladie vénérienne