α. late Middle English ressynnys (plural), late Middle English rison; English regional (northern and north midlands) 1700s risson, 1700s rysom, 1700s– rissom, 1800s– ris'm, 1800s– rism, 1800s– risom, 1800s– risome, 1800s– rissum; Scottish 1800s raisom, 1800s reisum, 1800s ressum, 1800s resum, 1800s rissim, 1800s– rissom, 1900s– ressom; Irish English (northern) 1900s– rissom, 1900s– risson.
β. 1600s rizome, 1700s razom; English regional (chiefly northern) 1700s rizom, 1700s–1800s ruzzom (Yorkshire), 1800s– rizm, 1800s– rizzim, 1800s– rizzom, 1800s– rizzum, 1900s– rhizome (Yorkshire).