parenchyma A portion of ground tissue (PO:0025059) composed of polyhedral cells typically with thin, non-lignified cellulosic cell walls and nucleate, living protoplasts. PO:0005421 PO_GIT:107 Parenchyma contains relatively unspecialized cells. par&#233nquima (Spanish, exact) plant_anatomy portion of parenchyma tissue (exact) portion of parenchymatous tissue (exact) 柔組織 (Japanese, exact) portion of ground tissue