The spelling of "pro tracts" can be explained using the International Phonetic Alphabet (IPA) transcription. The word is pronounced /prəʊ træks/ with emphasis on the first syllable. The first syllable "pro" is pronounced as "proh" with a long o sound. The second syllable "tracts" is pronounced as "trakts" with a short a sound. "Pro" means "in favor of" while "tracts" means "an extended area of land." Therefore, "pro tracts" refers to being in favor of large portions of land.