Citations:metric ounce

English citations of metric-ounce and metric ounce

31¼ grams

• 1869 July, Decimal-Point (pseudonym), “The French and English Systems of Money-Weights and Measures” in The Pharmaceutical Journal and Transactions, Second Series, volume XI, № i, page 32:

  In our coppers we have fifths and tenths both of the pound and the ounce, so that a farthing thrown into the scale with our ounce is the equivalent (within one grain) to the so-called metric-ounce or sixteenth of 500 grammes, and with eight halfpence on the pound we get the half-kilo quite near enough for practical purposes.

25 grams or CC

see the citations in the entry

28.25 grams

• 2013, Lianne C Webster, Pharmacy Practice for Today's Pharmacy Technician →ISBN, page 190:

  The metric ounce weight measurement is 28.35 g (Table 10-2)—not 28 g, not 29 g.

30 grams

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???

• 1870, French and English Systems of Money-Weights and Measures, in The Pharmaceutical Journal , page 31:

  The practice in the metric system is to treat the metric atom or the gramme as a weight equal to 4 gros; the so-called metric ounce of 31 1/4 grammes is made one of 30, so that 30 in the metric system is taken for 31 1/4. […] in practice they are compelled to accept a binary scale of 30 grammes as an ounce.

what other dictionaries have to say

• 2008, The Dictionary of Unfamiliar Words →ISBN:

  metric ounce A unit of mass equal to 25 grams. Also called a mounce.