mache noun3 •Valerianella locusta, a small dicot annual plant of the family Caprifoliaceae often cultivated as a salad green or herb. •(Philippines) Glutinous rice balls flavoured with coconut and pandan. •(old-fashioned) 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.