A mineral . . . augments not by growth, but by accretion.
Owen.
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They passed into a slightly more overgrown stretch of road, the kind that existed between two commercial areas and that gradually, by accretion, would be eliminated by another strip mall or auto parts store.
Alice Sebold. The Lovely Bones, p.233 (2002)
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Paul Goodlow pointing to map: Winter storm Xanto, "ice accretion" highlighted in pink (in Michigan and Pennsylvania)
The Weather Channel 4/15/2018 @9:41A.M. EST
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she had a fancy to do the torchlight dance; and in spite of his sciaticas, accretions, and rheumatisms, he was obliged to smile and say to her some gentle words and gallantries after all the evolutions, mummeries, and comic pantomimes, which she indulged in to divert herself
Honoré de Balzac. Droll Stories
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Invention is really nothing but a step by step movement; a little addition here, another accretion there, and so on, so that invention has been shown to be, not a matter of quantity, but of quality. The mere bending of a wire, if it produces a new and useful result, is just as much entitled to the dignity of an invention, as a room full of intricate mechanism.
Roger T. Finlay. The Wonder Island Boys: The Tribesmen (1914)
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Larry could see the drops accreting on the Z’s windshield now, as intimations of dawn began to creep into the eastern sky.