(informal) A malted milk; a milkshake with malted milk powder.
Among the most popular from the late nineteenth century on were malteds, milkshakes, and ice cream floats. […] Malted milk beverages were viewed as healthy, complete meal drinks that had particular appeal for men […] 2007, Andrew F. Smith, The Oxford Companion to American Food and Drink:
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malteds
Number=Plur
lexicographic
malted en · VERB
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(form-of, participle, past) simple past and past participle of malt