One of the mysteries of the English language finally explained.
1A plant grown indoors on a windowsill or close to a window.
2A plant having holes or transparent patches in its leaves; specifically any of various succulent plants having transparent or translucent areas at the ends of their fleshy leaves, through which light is transmitted to the rest of the plant, which is often buried in sand or loose soil, including members of the family Aizoaceae (especially the Namibian desert plant Fenestraria rhopalophylla) and of the genus Haworthia (family Asphodelaceae).
Mid 19th century. From window + plant.
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