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That one of a series of oxides having the lowest proportion of oxygen. See Proto-, 2 (b).

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  1. n. That one of a series of oxides having the lowest proportion of oxygen. See Proto-, 2 (b).
  2. That one of a series of oxides having the lowest proportion of oxygen. See Proto-, 2 (b). protoxide of nitrogen, laughing gas, now called hyponitrous oxideNO. See under Laughing.
  3. That one of a series of oxides having the lowest proportion ofoxygen. See Proto-, 2 (b). protoxide of nitrogen, laughing gas, nowcalled hyponitrous oxideNO. See under Laughing.
  4. n. That one of a series of oxides having the lowest proportion of oxygen. See Proto-, 2 (b).