One of the mysteries of the English language finally explained.
1Ecology. The arrangement or positioning of a plant's leaves so as to provide optimal exposure to the sun; an instance of this.
2Any plant disease characterized by mottled discoloration of the leaves.
Late 19th century; earliest use found in Nature: a weekly journal of science. From leaf + mosaic.
leaf mosaic/ˈliːf mə(ʊ)ˌzeɪɪk/
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