The word "pituitaries" refers to the pituitary gland. The spelling of this word is determined by its pronunciation, which is /pɪtjʊˈɛərɪz/. The initial syllable is pronounced as "pi" and the second syllable as "tu". The third syllable is pronounced with a schwa sound, which is represented by the letter "a" in the spelling. The last syllable is pronounced with an "eez" sound, which is represented by the letters "ar" and "ies". The word "pituitaries" is a plural noun, indicating more than one pituitary gland.