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plantain [plantain 词源字典]: 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[plantain etymology, plantain origin, 英语词源]
buttonwood (n.): also button-wood, "North American plane tree," 1690s, from button (n.) + wood (n.). So called for their characteristic round fruit.
plane (n.4): "tree of the genus Platanus," late 14c., from Old French plane, earlier plasne (14c.), from Latin platanus, from Greek platanos, earlier platanistos "plane tree," a species from Asia Minor, associated with platys "broad" (see plaice (n.)), in reference to its leaves. Applied since 1778 in Scotland and northern England to the sycamore, whose leaves somewhat resemble those of the true plane tree.
plantain (n.1): "banana," 1550s, plantan, from Spanish plátano, plántano, probably from Carib palatana "banana" (Arawak pratane), and altered by association with Spanish plátano "plane tree," from Medieval Latin plantanus "plane tree," itself altered (by association with Latin planta "plant") from Latin platanus (see plane (n.4)). So called from the shape of its leaves. There is no similarity or relation between this plant and plantain (n.2).