An Etymological Dictionary of the German Language/Dost
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Dost, Dosten, m., ‘marjoram,’ from MidHG. doste, toste, OHG. tosto, dosto, m., ‘wild thyme.’ It may be really identical with MidHG. doste, toste, m., ‘bunch, nosegay,’ so that ‘thyme’ would be a specialised meaning. The Goth. word was probably *þusta, ‘shrub.’ Further cognates to help in determining the root are wanting. Comp. Tost.