"Pregnatrienes" is a chemical term used to refer to a group of organic compounds. The correct spelling of this word is /ˌprɛɡnəˈtraɪiːnz/. The word is composed of three morphemes: "pregna-" referring to the chemical structure of the molecule, "-triene" indicating the presence of three double bonds in the molecule, and "-s" indicating a group or series of such compounds. The IPA transcription correctly portrays the pronunciation of each syllable and highlights the stress on the third syllable.