plantain: Two entirely unrelated plants have the name plantain. Both get it from their broad leaves. One, an insignificant-looking weed [14], comes via Old French plantain from Latin plantāgō, a derivative of planta ‘sole of the foot’ (source of English plantigrade and possibly plant). The other, a tropical plant of the banana family [16], was originally named by the Spaniards plántano ‘plane tree’, a descendant of the same Latin source as produced English plane (which etymologically means ‘broad-leaved’). This was adopted by English and quickly altered to the more familiar plantain. => plan, plant; plane
