Mache definitions

mäsh
Any of several plants of the genus Valerianella, especially a Eurasian annual (V. locusta) having small, white to pale bluish flowers and edible young leaves used in salads or as a potherb.
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Alternative spelling of mâche.
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(dated) A former unit of volumic radioactivity: the quantity of radon (ignoring its daughters) per litre of air which ionizes a sustained current of 0.001 esu.
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Origin of mache

French mâche from dialectal pomache from Vulgar Latin pōmasca from Latin pōmum fruit (perhaps because of its slightly sweet taste)