metric ounce

plural metric ounces · alternative metric-ounce

1. A metric approximation of the ounce; specifically:
   1. 25 grams.

      It would probably be convenient also to retain the ounce, the metric ounce being defined as equal to 25 grams, or one-twentieth of the metric pound.

      1901 September 7, The Accountant, volume 27, number 1396, page 975

      2 more examples

      The new ounces would be all alike, representing 25 Gm. or CC., and would be from one-eighth to one-fifth less than the customary ounces. The metric ounce, 25.0; one fifth less than 1 apoth. ounce, 31.0. The metric ounce, 25.0, one-sixth less than 1 av. ounce, 28.35.

      1901, The Medical Standard, volume 24, page 306

      When this is over, there seems no reason why a metric inch of twenty-five millimetres should not serve as well as our inch, a quarter-metre of ten metric inches as well as our foot, and a metric ounce of twenty-five grammes as well as our ounce.

      1904, “The Metric System”, in The Quarterly review, volume 199, page 78

   2. 30 grams.

      Thirty grams or a metric ounce (the American ounce is 28 grams)

      1882, An Instruction Book in the Art of Silk Culture, page 83

      2 more examples

      If we could get the Post Office Department to adopt the metric system, so that whenever any citizen of the United States desires to send a letter he will have to buy postage stamps of one or two cents — whatever it might be — for 30 grams of matter, the metric ounce, that would give us a start.

      1890, Proceedings of the American Pharmaceutical Association

      One 16-ounce pound of silver coin is legally equal to one 30-gram metric ounce of gold coin […]

      1901, Alfred Emerson, In yellowest jaunia and the way out: or, "Sound money", page 23