main stemOur editors are putting together more complete content — check back in about 20 minutesmain stemmain stem — noun名詞1. the primary stalk of a plant1.名詞釋義the primary stalk of a plant例句The main stem of the rose bush was damaged by the storm.2. the most important part or branch of something2.名詞釋義the most important part or branch of something例句The main stem of the river flows through the valley.